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Polyketide synthases (PKSs) are crucial multidomain enzymes in diverse natural product biosynthesis. Parrots use a type I PKS to produce a unique pigment called psittacofulvin in their feathers. In domesticated budgerigars and lovebirds, the same amino acid substitution (R644W) within malonyl/acetyltransferase (MAT) domain of this enzyme has been shown to cause the blue phenotype with no psittacofulvin pigmentation, proposing a strong evolutionary constraint on the mechanism. Here, we identified seven previously unreported variants in PKS associated with defective psittacofulvin production in four diverse species, including three nonsense mutations. Intriguingly, three of the remaining nonsynonymous substitutions reside within the ketoacyl synthase (KS) domain, whereas one at MAT domain. The heterologous expression of these PKS variants in yeast confirmed complete or partial loss of psittacofulvin production. These findings establish PKS as a functionally conserved key-enzyme determining psittacofulvin-based hues among diverse parrots, highlighting multiple conserved domains essential for the PKS function. Mutations in polyketide synthase (PKS) disrupt psittacofulvin pigment production in parrots, altering feather hues. Seven unique variants in multiple conserved domains reveal a shared mechanism across four species and underscore PKS's multidomain role in parrot coloration. [ABSTRACT FROM AUTHOR]

The avifaunal diversity assessment is a valuable ecological tool, providing a significant measure for assessing the quality and quantity of various habitats. Karsog is located in Mandi district of Himachal Pradesh, India, in the Pir Panjal Himalayan range. Avifaunal study was conducted on a monthly basis in the Tehsil Karsog from December 2023 to June 2024. The study revealed the presence of 91 bird species, spanning over 63 genera, 38 families, 12 orders. The Order Passeriformes was the most diverse with 64 species, while Bucerotiformes and Strigiformes were represented by one species each. The Muscicapidae, with 12 species, was the dominant family in the study area. Analysis of data on relative abundance showed that of the 91 species recorded, 23 species (25.27%) were very common, 27 species (29.67%) were common, 26 species (28.57%) were uncommon, and 15 species (16.48%) were rare. Among the documented avifauna, 2 species, the Alexandrine Parakeet and the Himalayan Griffon are Near Threatened species as categorized by the IUCN Red List (2024). Assessment of data on feeding guild shows that, out of 91 species, 2 species (2.19%) are granivores, 3 species (3.29%) are carnivores, 11 species (12.08%) are omnivores, 17 species (18.68%) are insectivores and 58 species (63.73%) have varied type of feeding habits. It shows that 22 species (24.17%) have a narrow feeding guild meaning that they rely on limited type of food resources. Further analysis of data on the population status reveals that 17 species (18.68%) have declining population trend as per the IUCN global population trend assessment. This emphasizes the importance of implementing conservation strategies in the area under investigation. [ABSTRACT FROM AUTHOR]

Urban ecosystems are suitable for the introduction and spread of alien bird species, and early detection of their establishment and expansion is crucial to reduce potential negative impacts. In this context, the use of opportunistic citizen science data can have considerable advantages in relation to conventional scientific approaches. We gathered records of parakeets and parrots (Psittaciformes) and mynas and starlings (Sturnidae) for the urban area of Lisbon (Portugal) from the eBird database. We used this opportunistic citizen science data to document the establishment and expansion and to estimate distribution trends of alien bird species in urban ecosystems. In the last decade there has been a considerable increase in the amount of opportunistic citizen science data available in eBird for our study area. The probability of presence of the Senegal parrot, rose-ringed parakeet, blue-crowned parakeet, and crested myna was positively influenced by the number of lists. For the rose-ringed parakeet, blue-crowned parakeet, and crested myna, the year positively influenced the probability of presence, suggesting an increase in distribution range. We observed that spatio-temporal variations in effort associated to opportunistic citizen science data sources may generate bias in trend estimates, and therefore we recommend the effort should always be accounted for. Our approach agreed with the documented expansion of alien bird species in the study area, supporting the potential usefulness of opportunistic citizen science in providing early detection on biological invasions in urban ecosystems, particularly where this is the best or the only source of information available. [ABSTRACT FROM AUTHOR]

The monk parakeet (Myiopsitta monachus) is an invasive species introduced in Chile during the early seventies and now abundant in several areas of Santiago metropolis. For most of our knowledge, there are no genetic studies focused on the invasion of monk parakeets in Chile. The current study aims to assess the levels of population structure in monk parakeets from different municipalities in Santiago through next generation sequencing. Genetic material was obtained from pectoral muscle collected from monk parakeet fledglings (n = 204) sampled in Santiago, Chile. Using Double digest, restriction-site associated DNA (ddRADseq), 102,834 loci and 3195 SNPs were identified, allowing a high-resolution study in a population with little genetic diversity explained by an invasive founder effect. Genetic structure was modeled using the fixation index, STRUCTURE, and principal component analyses. Results showed low levels of genetic structure in the monk parakeet population from Santiago, evidencing high genetic flow between all studied municipalities. However, slight differences were observed when parakeets from the northern areas of Santiago were compared to those from the rest of the city. The geography of the city might explain these differences; with a small succession of hills of up to 400 m, potentially in-part isolating a northern reproductive colony. It is also possible that this northern population originated from or bred with a different release event or a combination of these factors. This study represents the first genetic characterization of monk parakeets in Chile and provides a high-resolution model to study recent invasion processes. [ABSTRACT FROM AUTHOR]

Obtaining precise estimates of population size and trends through time is important for the effective management and conservation of threatened species. For parrots (Psittaciformes: Psittacidae), obtaining such estimates can be challenging, particularly for cryptic species that occur in low densities in complex and/or fragmented habitats. We used a statistical resampling approach with the aim to compare the reliability and precision of counts for the critically endangered Tasman parakeet (Cyanoramphus cookii) that were taken using two methods on Norfolk Island (Pacific Ocean), namely, fixed-point counts and line transect counts. The detections obtained during fixed-point counts had better estimated precision (0.274) than line transect counts (0.476). The fixed-point method was also more efficient, yielding 1.338 parakeet detections per count compared to the 0.642 parakeet detections per count obtained by the line transect method. Although Tasman parakeets can be detected by either of these methods, our research demonstrates that the fixed-point method is more precise and reliable. These findings can help prioritise resources for the long-term monitoring of recovering populations of this species and similar island species. [ABSTRACT FROM AUTHOR]

Trichomonas gallinae is a widespread protozoan parasite that primarily affects birds, causing a disease known as avian trichomonosis. The present study aimed to investigate the prevalence and genetic diversity of T. gallinae, a parasite causing avian trichomoniasis in feral pigeons, budgerigars, and finches in Tehran, Iran. The 5.8S ribosomal RNA locus, along with the internal transcribed spacer 2 (ITS2) region, has been extensively utilized for genotype identification and for determining inter- and intra-specific diversity. More recently, the Fe-hydrogenase (Fe-Hyd) gene has been suggested as an additional genetic marker to enhance the accuracy of strain subtyping discrimination. In the present study, a total of 12% (12/100) birds examined were infected with T. gallinae using microscopy and PCR methods. Infection was found in seven of 30 (23.3%) feral pigeons, three of 40 (7.5%) budgerigars, and two of 30 (6.66%) finches. Analysis of the ITS2 region of T. gallinae isolates revealed two highly similar sequences. The first sequence (GenBank: OQ689964-OQ689970) was found in five feral pigeons and two budgerigars, whereas the second sequence (GenBank: OQ689971-OQ689975) was identified in two feral pigeons, one budgerigar, and two finches. Phylogenetic analysis confirmed the presence of two distinct clusters (cluster I and cluster II) within the trichomonads based on the ITS2 region. However, further analysis using Fe-Hyd revealed greater diversity, with three subtypes identified (A1, A2, and C1). One isolate identified in the present study (GenBank accession number: OQ694508.1) belonged to subtype A1. Combining ITS2 and Fe-Hyd markers holds promise for a more comprehensive understanding of the population structure of T. gallinae and the potential role of ITS2 in host adaptation. [ABSTRACT FROM AUTHOR]

This paper presents Nesting Ferality, a performative installation that examines how feral rose-ringed parakeets are represented online and governed in Dutch cities. Expanding existing research at the interconnection of artistic practice and cultural geography, the installation incorporates and performs quantitative and qualitative data in an exhibition space. The project deploys everyday digital technologies in novel ways to reshape people's perception and to explore how artists and geographers can collaborate to foster new environmental politics and mobilise new publics. [ABSTRACT FROM AUTHOR]

The auditory brainstem response (ABR) can be used to evaluate hearing sensitivity of animals. However, typical measurement protocols are time-consuming. Here, an adaptive algorithm is proposed for efficient ABR threshold estimation. The algorithm relies on the update of the predicted hearing threshold from a Gaussian process model as ABR data are collected using iteratively optimized stimuli. To validate the algorithm, ABR threshold estimation is simulated by adaptively subsampling pre-collected ABR datasets. The simulated experiment is performed on 5 datasets of mouse, budgerigar, gerbil, and guinea pig ABRs (27 ears). The datasets contain 68–106 stimuli conditions, and the adaptive algorithm is configured to terminate after 20 stimuli conditions. The algorithm threshold estimate is compared against human rater estimates who visually inspected the full waveform stacks. The algorithm threshold matches the human estimates within 10 dB, averaged over frequency, for 15 of the 27 ears while reducing the number of stimuli conditions by a factor of 3–5 compared to standard practice. The intraclass correlation coefficient is 0.81 with 95% upper and lower bounds at 0.74 and 0.86, indicating moderate to good reliability between human and algorithm threshold estimates. The results demonstrate the feasibility of a Bayesian adaptive procedure for rapid ABR threshold estimation. [ABSTRACT FROM AUTHOR]

Simple Summary: Artificial light at night (ALAN) is increasingly being recognized as a new and rapidly growing form of environmental pollution that may impose severe health and ecological consequences. In our study, we examined the effects of bright ALAN exposure with increasing duration on growth and reproduction success in Budgerigars (Melopsittacus undulatus). Strong correlations have been detected between artificial light at night, melatonin sulfate levels, and both body mass and reproductive success. ALAN increased body mass gain and reduced reproduction efficiency in exposed birds compared with controls. Additionally, melatonin levels were also suppressed in an exposure dose-dependent manner, suggesting a role for the hormone suppression in mediating the effects of the environmental exposure on the growth and reproduction responses of Budgerigars. Short-wavelength artificial light at night is increasingly being associated with health and ecological risks. The negative impact of this relatively new source of pollution has been studied intensively in wild birds but to a much lesser extent in captive conspecifics. Using an avian model, our objective was to evaluate the effects of short-wavelength (200 lux at 460 nm) lighting on the body mass and reproductive success of Budgerigars (Melopsittacus undulatus) under captive conditions. Birds were maintained under a naturally increasing photoperiod from March to June, with one daily artificial light at night exposure of increasing duration (0, 30, 60, and 90 min) in the middle of the dark period. During the experiments, birds were monitored monthly for body mass, number of eggs laid, hatching success, and melatonin sulfate levels in droppings. Artificial light at night increased body mass and decreased melatonin sulfate levels as well as the number of eggs and hatching success in a duration dose-dependent manner. Our findings provide further evidence of the potential adverse impact of artificial light at night on captive birds and advocate the need for effective controlling measures for light pollution. [ABSTRACT FROM AUTHOR]

In Romania, rose-ringed parakeets Psittacula krameri (Scopoli, 1769) came from the pet trade and captivity (birds were either deliberately released or they escaped). Most observations are in the urban parks of Bucharest or near them but individuals have also been reported in counties like Bihor, Brașov, Brăila, Călărași, Cluj, Dolj, Galați, Harghita, Iași, Ilfov, Mureș, Prahova and Timiș. The first individuals were seen in 2009 in Tineretului Park, Bucharest. Breeding was confirmed in May 2016 when two adults were reported feeding two or maybe three juveniles. Rose-ringed parakeet numbers fluctuate in Bucharest from 2010 to 2023, with the highest number being recorded in 2013, when 19 individuals were observed. In 2023, the highest number of gathered birds was four individuals and other four birds being present in other parts of the city, summing eight birds. It is currently unknown how many individuals come from captivity and how many from successful breeding in the wild. Additional surveys are required to determine the precise size of the free-ranging population and to oversee their integration into the avian fauna of Romania. [ABSTRACT FROM AUTHOR]

We report on a previously healthy zoo specimen of an adult budgerigar (Melopsittacus undulatus, obtainedwithpermission fromSouthwick'sZoo) founddeceased in its enclosure. To assess cause of death and ensure the absence of an infectious neoplasia, we used an integrated multiscale brain-imaging workflow, previously only used on mammals. The specimen was imaged with microcomputed tomography before and after enhancing soft-tissue contrast with diffusible iodine-based contrast-enhanced microcomputed tomography. Scans revealed an orbital blowout fracture and an unidentified large mass across majority of the diencephalon, striatum and midbrain caudal to the right orbit. After destaining, neural pathohistology confirmed the mass as a brain haemorrhage with no evidence of neoplasia or inflammation. We conclude that this specimen died of head trauma, likely from a head-on collision within its enclosure. This multiscale imaging workflow (diffusible iodine-based contrast-enhanced microcomputed tomography followed by destaining and pathohistology) can improve our evaluation of differential diagnoses in avian specimens. [ABSTRACT FROM AUTHOR]

ABSTRACT: Deviations from the normal in the intrauterine formative phase have a permanent effect in an individual's life. They can cause limitations in lifestyle from nil to severe. The sites may differ and hence would the presentations. Some of them together may form a syndrome while others could present as solitary findings. The below case report affirmed the presence of a unique non-syndromic triad of micrognathia, oligodontia and ankyloglossia which the authors named as " Budgie Triad." Such rare findings can add to the existing knowledge and will help the clinicians in appropriate diagnosis and treatment planning helping in improving the patient's quality of life. [ABSTRACT FROM AUTHOR]

Abstract Background Most vocal learning species exhibit an early critical period during which their vocal control neural circuitry facilitates the acquisition of new vocalizations. Some taxa, most notably humans and parrots, retain some degree of neurobehavioral plasticity throughout adulthood, but both the extent of this plasticity and the neurogenetic mechanisms underlying it remain unclear. Differential expression of the transcription factor FoxP2 in both songbird and parrot vocal control nuclei has been identified previously as a key pattern facilitating vocal learning. We hypothesize that the resilience of vocal learning to cognitive decline in open-ended learners will be reflected in an absence of age-related changes in neural FoxP2 expression. We tested this hypothesis in the budgerigar (Melopsittacus undulatus), a small gregarious parrot in which adults converge on shared call types in response to shifts in group membership. We formed novel flocks of 4 previously unfamiliar males belonging to the same age class, either “young adult” (6 mo − 1 year) or “older adult” (≥ 3 year), and then collected audio-recordings over a 20-day learning period to assess vocal learning ability. Following behavioral recording, immunohistochemistry was performed on collected neural tissue to measure FoxP2 protein expression in a parrot vocal learning center, the magnocellular nucleus of the medial striatum (MMSt), and its adjacent striatum. Results Although older adults show lower vocal diversity (i.e. repertoire size) and higher absolute levels of FoxP2 in the MMSt than young adults, we find similarly persistent downregulation of FoxP2 and equivalent vocal plasticity and vocal convergence in the two age cohorts. No relationship between individual variation in vocal learning measures and FoxP2 expression was detected. Conclusions We find neural evidence to support persistent vocal learning in the budgerigar, suggesting resilience to aging in the open-ended learning program of this species. The lack of a significant relationship between FoxP2 expression and individual variability in vocal learning performance suggests that other neurogenetic mechanisms could also regulate this complex behavior.

Simple Summary: The global trade of pet birds has grown significantly, leading to more non-native birds being introduced into the wild. Our study examined the potential habitats and environmental factors that might allow pet birds lost and sighted in South Africa to survive outside captivity. Using geographic location data of pet birds, we predicted which areas might be suitable for various species such as the African grey parrot, Budgerigar, Cockatiel, Green-cheeked conure, Monk parakeet, and Rose-ringed parakeet. We found that a significant portion of South Africa could support these species, with some areas being highly suitable. The study highlighted how pet birds could escape or be released into the wild due to human activities, and that urban areas are particularly at risk. This research emphasizes the need for careful monitoring to prevent these birds from becoming invasive, which could impact local ecosystems and biodiversity. The global trade of non-native pet birds has increased in recent decades, and this has accelerated the introduction of invasive birds in the wild. This study employed ensemble species distribution modelling (eSDM) to assess potential habitat suitability and environmental predictor variables influencing the potential distribution of non-native pet bird species reported lost and sighted in South Africa. We used data and information on lost and found pet birds from previous studies to establish and describe scenarios of how pet birds may transition from captivity to the wild. Our study revealed that models fitted and performed well in predicting the suitability for African grey (Psittacus erithacus), Budgerigar (Melopsittacus undulatus), Cockatiel (Nymphicus hollandicus), Green-cheeked conure (Pyrrhura molinae), Monk parakeet (Myiopsitta monachus), and Rose-ringed parakeet (Psittacula krameri), with the mean weighted AUC and TSS values greater than 0.765. The predicted habitat suitability differed among species, with the suitability threshold indicating that between 61% and 87% of areas were predicted as suitable. Species with greater suitability included the African grey, Cockatiel, and Rose-ringed parakeet, which demonstrated significant overlap between their habitat suitability and reported lost cases. Human footprint, bioclimatic variables, and vegetation indices largely influenced predictive habitat suitability. The pathway scenario showed the key mechanisms driving the transition of pet birds from captivity to the wild, including the role of pet owners, animal rescues, adoption practices, and environmental suitability. Our study found that urban landscapes, which are heavily populated, are at high risk of potential invasion by pet birds. Thus, implementing a thorough surveillance survey is crucial for monitoring and evaluating the establishment potential of pet species not yet reported in the wild. [ABSTRACT FROM AUTHOR]

Background: Most vocal learning species exhibit an early critical period during which their vocal control neural circuitry facilitates the acquisition of new vocalizations. Some taxa, most notably humans and parrots, retain some degree of neurobehavioral plasticity throughout adulthood, but both the extent of this plasticity and the neurogenetic mechanisms underlying it remain unclear. Differential expression of the transcription factor FoxP2 in both songbird and parrot vocal control nuclei has been identified previously as a key pattern facilitating vocal learning. We hypothesize that the resilience of vocal learning to cognitive decline in open-ended learners will be reflected in an absence of age-related changes in neural FoxP2 expression. We tested this hypothesis in the budgerigar (Melopsittacus undulatus), a small gregarious parrot in which adults converge on shared call types in response to shifts in group membership. We formed novel flocks of 4 previously unfamiliar males belonging to the same age class, either "young adult" (6 mo − 1 year) or "older adult" (≥ 3 year), and then collected audio-recordings over a 20-day learning period to assess vocal learning ability. Following behavioral recording, immunohistochemistry was performed on collected neural tissue to measure FoxP2 protein expression in a parrot vocal learning center, the magnocellular nucleus of the medial striatum (MMSt), and its adjacent striatum. Results: Although older adults show lower vocal diversity (i.e. repertoire size) and higher absolute levels of FoxP2 in the MMSt than young adults, we find similarly persistent downregulation of FoxP2 and equivalent vocal plasticity and vocal convergence in the two age cohorts. No relationship between individual variation in vocal learning measures and FoxP2 expression was detected. Conclusions: We find neural evidence to support persistent vocal learning in the budgerigar, suggesting resilience to aging in the open-ended learning program of this species. The lack of a significant relationship between FoxP2 expression and individual variability in vocal learning performance suggests that other neurogenetic mechanisms could also regulate this complex behavior. [ABSTRACT FROM AUTHOR]

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Amateur breeding of parrots as pets has contributed to many species being found in areas where they never occurred in the wild, particularly in warmer regions, but also in the temperate climates of North America and Europe. Climate change is likely to exacerbate this process. We hypothesised that parrots occurred in the wild in the cities of Poland, especially the rose-ringed parakeet, as there are reports of breeding sites in the literature. Using information on lost, found and sighted parrots posted on social media, we have analysed the extent of parrot emergence in Poland. In a period of less than two years (from October 2018, through 2019 and from June to the end of December 2021), 2,675 parrot specimens of 49 species were found in the wild. The most frequently observed species were cockatiel Nymphicus hollandicus (N = 962), budgerigar Melopsittacus undulatus (N = 884) and rose-ringed parakeet Psittacula krameri (N = 182). Parrots were most frequently observed in urban areas, in regions characterized by a higher population size, a higher income and a higher proportion of people with a university degree. Our study shows that the occurrence of parrots, especially rose-ringed parakeets in the wild, needs to be monitored as new breeding sites may appear. [ABSTRACT FROM AUTHOR]

Parrots (Order: Psittaciformes) are a diverse clade that is easily distinguishable from other birds. Despite the clear characters that define Psittaciformes (hooked bills, zygodactylous feet, and plumage that is often predominantly green or red), relative morphological uniformity among parrots has made taxonomic classification a fraught endeavor for over a century. Parrot systematics were propelled forward when DNA sequencing data shed insights into higher- and species-level relationships. However, despite these significant advances, major gaps in taxon sampling and uncertainty in relationships remained due to inferring phylogenetic relationships with short fragments of DNA. Recent work using genome-wide molecular markers with nearly complete parrot species-level sampling has brought clarity to many of the remaining outstanding questions on taxonomic relationships. Here, we build on this work by including four additional species to present a taxonomic revision of Psittaciformes better aligned with its evolutionary tree. We infer maximum likelihood and time-calibrated phylogenies for parrots, present accounts for 106 genera, compare how our findings relate to previous work, and highlight future areas of research. The family-group nomenclature we propose reflects deep evolutionary divergences with diagnosable synapomorphies that are commensurate across comparable ranks in psittaciform clades. We erect three new family-group names at the rank of tribe (Brotogerini Smith, Thom, and Joseph, 2024; Neophemini Schodde, Mason, Smith, Thom, and Joseph, 2024; Bolbopsittacini Smith, Thom, and Joseph, 2024). We elevate one tribe to subfamily rank for the cacatuid genus Probosciger and we restrict usage of the recently introduced tribe Touitini to its type genus Touit. At shallower taxonomic scales, recognition of more rather than fewer genera addresses issues of paraphyly or high discordance in morphological and genomic characters at those levels. We support many reinstatements of older generic names advocated in recent decades, and we further reinstate five valid, available generic names not widely used in recent literature if at all (Licmetis, Gymnopsittacus, Clarkona, Suavipsitta, Cardeos). We advocate the retention of Vini Lesson, 1833, over Coriphilus Wagler, 1832, based on preliminary examination showing substantially more frequent usage of the former. We redraw generic limits in some other cases (e.g., Bolborhynchus parrotlets and allies) and this includes recognizing fewer genera than recently proposed for the Psittacula sensu lato ringneck parakeets. Our revised classification of parrots addresses many longstanding taxonomic questions including those that have arisen through the acquisition of genetic data. It provides context for the temporal origins of psittaciform clades and the taxonomic and phenotypic diversification throughout their evolutionary history. We hope that it will be a benchmark guiding further taxonomic study as well as for downstream analyses in many other fields. [ABSTRACT FROM AUTHOR]

The present paper discusses the frugivorous bird and mammalian pest species on cultivated fig, Ficus carica L. in Punjab, India. This study was conducted for 10 years from 2014 to 2024. A total of 11 frugivorous pests including 9 bird species namely; Indian Grey Hornbill Ocyceros birostris (Scopoli), Asian Koel Eudynamys scolopacea (Linnaeus), House Crow Corvus splendens (Vieillot), Jungle Babbler Turdoides striata (Dumont), Red-vented Bulbul Pycnonotus cafer (Linnaeus), Common Myna Acridotheres tristis (Linnaeus), Brown-headed Barbet Megalaima zeylanica (Gmelin), Coppersmith Barbet Megalaima haemacephalus (Statius Muller), Rose-ringed Parakeet Psittacula krameri (Scopoli) falling under 5 orders and 8 families and two mammals (Indian flying fox, Pteropus giganteus (Brunnich) and Northern palm squirrel, Funambulus pennantii (Wroughton) were recorded to act as pests of fruits of F. carica at the three locations of the Punjab state, India. Passeriformes was found to be the dominating amongst all with birds of four families damaging the fruits. Amongst all, Rose-ringed parakeet and Northern palm squirrel were observed causing significant damage to the fruits throughout the fruiting season. Rose-ringed parakeet was observed causing damage at all the three locations surveyed. All the recorded species are of least concern status as per IUCN. These pests caused 18.3-29.4 per cent damage on fig fruits at different locations in Punjab. [ABSTRACT FROM AUTHOR]

Illegal or poorly regulated wildlife trade may enhance parasite spread worldwide, leading to pathogen outbreaks and the emergence of diseases affecting native wildlife, domestic animals and humans. The order Psittaciformes has the largest proportion of endangered species among all birds worldwide and is one of the most trafficked taxa in the pet trade. However, despite the large number of parrot species commercialized worldwide, the influence of illegally traded wild birds on the introduction of exotic pathogens is still poorly investigated. Here we molecularly examined the prevalence and genetic diversity of haemosporidian parasites in illegally traded white‐winged parakeets (Brotogeris versicolurus), one of the most trafficked parrots in South America. We found that 18.5% of parakeets harboured Plasmodium relictum GRW04, a highly invasive malaria parasite provoking population decline and even extinctions in native avifauna when established outside its natural range. We also showed that malaria infected birds have lower body condition than uninfected parakeets, revealing the negative effects of malaria on their avian hosts. These outcomes highlight the risk of malaria spill over and disease outbreak in illegally traded wildlife. Our results also reveal epidemiological key concepts in disease transmission, such as the role of poorly studied parrot species as natural reservoir hosts of haemosporidians. These findings stress the importance of enforcing health control regulations and trade policies to fight wildlife trafficking effectively. [ABSTRACT FROM AUTHOR]

The Kangean islands are a biologically poorly known archipelago situated in the Java Sea, Indonesia, 120 km directly north of Bali and 124 km off East Java. These islands host an avifauna comprising at least 13 endemic subspecies, two of which have by some sources recently been considered species. We combine historical published literature with our own surveys of the archipelago in 2007-2008, 2010 and 2023 to produce an updated list of the islands' birds (n=140 species) and their distribution across the islands. We evaluate in more detail the conservation status of all endemic taxa, as well as several others we consider to be of concern. Despite its current listing as Vulnerable on the IUCN Red List, the endemic Kangean Tit-babbler Mixornis prillwitzi is common in highly degraded habitats, including scrub, and is probably one of the islands' least threatened birds. However, because of trapping, the archipelago's endemic taxon of Red-breasted Parakeet Psittacula alexandri kangeanensis, and its populations of Green Junglefowl Gallus varius and Common Hill Myna Gracula religiosa are likely at risk of extirpation. The endemic taxon of White-rumped Shama Copsychus malabaricus nigricauda, sometimes afforded species rank as 'Kangean Shama', may already be (at least functionally) extinct in the main archipelago, with no record since 2007-2008. We recommend longer and more detailed surveys of the islands' birds, and that an effective protected area is established on the main Kangean island, which hosts the largest area of remaining forest in the archipelago and most of its endemic taxa. [ABSTRACT FROM AUTHOR]

Abstract Predation risk may affect the foraging behavior of birds. However, there has been little research on the ability of domestic birds to perceive predation risk and thus adjust their feeding behavior. In this study, we tested whether domestic budgerigars (Melopsittacus undulatus) perceived predation risk after the presentation of specimens and sounds of sparrowhawks (Accipiter nisus), domestic cats (Felis catus), and humans, and whether this in turn influenced their feeding behavior. When exposed to visual or acoustic stimuli, budgerigars showed significantly longer latency to feed under sparrowhawk, domestic cat, and human treatments than with controls. Budgerigars responded more strongly to acoustic stimuli than visual stimuli, and they showed the longest latency to feed and the least number of feeding times in response to sparrowhawk calls. Moreover, budgerigars showed shorter latency to feed and greater numbers of feeding times in response to human voices than to sparrowhawk or domestic cat calls. Our results suggest that domestic budgerigars may identify predation risk through visual or acoustic signals and adjust their feeding behavior accordingly.

Vascular hamartomas, though rare, can manifest in avian species, presenting diagnostic intricacies for clinicians. A 12-year-old male rose-ringed parakeet presented with a mass between the upper and lower mandibular angles on the right side. The mass was surgically removed. Histopathological examination confirmed the diagnosis of a cutaneous vascular hamartoma. The bird recovered uneventfully and 6 months later showed no evidence of recurrence. This report contributes to the understanding of vascular tumors in avian species. [ABSTRACT FROM AUTHOR]

The objectives of this study were to identify the species of psittaciform birds kept in captivity as companion and ornamental animals in Yucatán, Mexico, as well as to estimate the prevalence and intensity of the intestinal parasites. 16 species of psittaciform belonging to 11 different genera were studied, of which three species are locally distributed (Amazona albifrons, Amazona xantholora and Eupsittula nana astec), two are introduced (Amazona autumnalis and Amazona oratrix) and 11 are exotic (Agapornis sp., Amazona auropalliata, Amazona farinosa, Aratinga solstitialis, Barnardius zonaris, Cyanoramphus novaezelandiae, Melopsittacus undulatus, Noephema bouerkii, Nymphicus hollandicus, Psephotus sp. and Psittacula krameri) for the state of Yucatán, Mexico. A total of 84 stool samples were obtained and processed using the centrifugal flotation and McMaster techniques. A prevalence of 14.28 % of birds with intestinal parasites was estimated, reporting the presence of the nematodes Ascaridia spp. (33.3 %), Capillaria spp. (16.6 %) and Heterakis spp. (16.6 %), cestodes Hymenolepis spp. (16.6 %) and Raillietina spp. (8.3 %) and the protozoan Eimeria spp. (16.6 %). The intensity of eggs and oocysts per gram of feces (h/gh and ooq/gh) was from <50 to 600, with high intensities only observed in exotic species such as B. zonaris and C. novaezelandiae. It is concluded that six genera of intestinal parasites were present in psittaciforms from Yucatán, Mexico with nematodes being the ones that appeared most frequently. The highest intensities occurred in exotic bird species, being important in the implementation of deworming and quarantine protocols to prevent parasitic infections in birds. [ABSTRACT FROM AUTHOR]

Various companion birds, including budgerigars, are anesthetized with injectable anesthesia. The current study aimed to evaluate oxidative stress indices including malondialdehyde (MDA), total antioxidant capacity (TAC), total oxidant status (TOS), and oxidative stress index (OSI) along with clinical parameters such as the time required to induce, maintain and recover from medetomidine-ketamine anesthesia and midazolam-ketamine anesthesia in budgerigars. Among 20 mature and healthy budgerigars, three groups were assigned as follows: Control (n = 4) to determine baseline oxidative stress indices medetomidine + ketamine (n = 8) anesthetized by intramuscular injections of medetomidine (0.04 mg kg-1) and ketamine (30.00 mg kg-1) in the pectoral muscles, midazolam + ketamine (n = 8) anesthetized by intramuscular injections of midazolam (1.00 mg kg-1) and ketamine (50.00 mg kg-1). Half of birds (n = 4) in the second and third groups were euthanized by cervical dislocation 1 hr after anesthesia induction, blood samples were collected directly from the heart, and sera were extracted. Additionally, the remaining birds were euthanized 24 hr later, and their serum was analyzed for oxidative stress indices. Clinical parameters were recorded during the study. Compared to the medetomidine + ketamine group, the midazolam + ketamine group experienced shorter induction, anesthetic, and recovery times. Administering medetomidine and ketamine elevated TOS levels compared with midazolam + ketamine. No significant difference was found between the test groups for TAC, MDA, or OSI. Therefore, the midazolam + ketamine regimen appears superior to medetomidine + ketamine when performing minor surgeries on budgerigars. [ABSTRACT FROM AUTHOR]

Investigations of the parasites associated with extinct avian species provide unique insights into the ecology and evolution of both hosts and their parasitic counterparts. In the present paper, a new quill mite species, Peristerophila conuropsis sp. n., belonging to the family Syringophilidae (Prostigmata: Cheyletoidea) is described from the Carolina parakeet Conuropsis carolinensis Linnaeus (Psittaciformes: Psittacidae). This new species was collected from museum dry skin of the Carolina parakeet, the only native representative of the Psittacidae in the United States, which was an abundant resident of the southeastern and midwestern states and has been extinct in the beginning of the 20th century. Comment on the current taxonomic state and host associations of the genus Peristerophila are provided. Based on the host associations and habitats occupied by Peristerophila and related genera on parrots, it is hypothesized with the high probability that P. conuropsis has been extinct along with its host. [ABSTRACT FROM AUTHOR]

Avian gastric yeast (Macrorhabdus ornithogaster) is an anamorphic ascomycetous yeast which colonises the junction between proventriculus and ventriculus in many species of birds. Although a normal flora, sometimes it causes a subclinical infection and at times lead to gastric infections. The present study confirmed the presence of Macrorhabdus ornithogaster from faecal samples of budgerigar with symptoms like regurgitation and chronic wasting. Gram's staining of the direct smear demonstrates large number of pleomorphic Gram positive organisms. The organism could be cultured on blood agar, Sabouraud's dextrose agar and De Man Rogosa and Sharpe agar but not on MacConkey agar. The organisms were found to be negative for catalase and oxidase and did not reduce nitrate. It produced acid from maltose, sucrose, glucose, galactose and trehalose and not from raffinose and lactose. The cultural and biochemical characters of the isolate along with clinical symptoms confirmed the case as avian gastric yeast infection. [ABSTRACT FROM AUTHOR]

Wildlife management can generate social conflict when stakeholder perceptions of the target species are not considered. Introduced Ring-necked Parakeets (RNP) are established in the UK and have been added to the 'general licence' of birds that can be killed to prevent serious economic damage. We aimed to better understand perceptions of RNPs on a nationwide scale to inform mitigation actions for potential future conflict over RNP management. We surveyed 3,947 UK residents to understand awareness of, knowledge of and attitudes towards the RNP across the UK. We found that most respondents (90.2%) were aware of the RNP. Almost half of respondents (45.9%) held negative opinions, particularly against the RNP in rural areas (64.7%), suggesting landscape contexts influence attitudes. Respondent preference for the RNP was low in local neighbourhoods (7.80%) although the species was considered aesthetically pleasing by most (83.0%). Many respondents knew the species' name (54.9%), but underestimated current population numbers in the UK (82.6%) and few knew its full native range (10.0%). We identified respondents' ecological interest, age, education, preference for, awareness of and knowledge of the RNP as significant factors associated with perceptions. Our findings suggest that the RNP presents a complex socio-environmental challenge, with respondent awareness, knowledge and attitudes each forming an important component of perceptions towards this species. We recommend that wildlife managers utilise our findings and cohesive approach to enhance future RNP perception research in the UK and abroad and towards the success of any proposed management initiatives under the UK general licence. [ABSTRACT FROM AUTHOR]

Objective: To determine the potential distribution of the monk parakeet (Myiopsitta monachus) in Mexico. Design/methodology/approach: The study generated the model with confirmed presences of the species, the MaxEnt algorithm, and bioclimatic and elevation information. The evaluation, calibration and selection were carried out with the kuenm package in R. The model generated was projected to the geographic space of Mexico. Results: The model estimated the most favorable areas for the species in Mexico, based on the similarity of the climate and elevation conditions of the sites with its natural distribution. The most favorable sites for the species are distributed in the central-southern regions of the country. Variables influencing its distribution are derived from temperature, precipitation and elevation. Limitations on study/implications: The model can contribute to the planning of management and monitoring strategies that mitigate the invasion of this species. Findings/conclusions: The areas in Mexico where there is a high risk of invasion by the monk parakeet were identified. [ABSTRACT FROM AUTHOR]

The Golden Parakeet is an endemic Brazilian flagship species that has suffered from poaching and habitat loss, leading to local extinctions in the urbanized parts of the Amazon. We reintroduced six groups of mostly captive-bred parakeets in a protected area. The birds were acclimatized for at least five months at the release site, where they were trained to recognize native foods and develop foraging skills. Subsequently, we conducted a soft release, followed by daily supplementation and monitoring. For three years following the release we recorded their diet, feeding behavior, and how they adapted to wild foraging. The reintroduced birds fed on 23 plant species, with 13 not being previously listed in past studies. The three most consumed species corresponded to 77% of their feeding records. Parakeets spent more time feeding in altered landscapes and secondary vegetation than in the preserved forest. Most of the feeding happened during the rainy season when most of their favorite plants are fruiting. The parakeets' incorporation of new species in their diet and their transition from supplemental to natural feeding happened gradually, as we did not reduce food offerings. Parakeets that showed site fidelity were able to find native food rapidly following release, but individuals that dispersed immediately had more difficulty finding food. This study showed that captive-bred Golden Parakeets can transition to a wild diet following a gradual reintroduction process. [ABSTRACT FROM AUTHOR]

This report describes pancreatic insufficiency in parrots. A pair of budgies with a 3-month history of lethargy and emaciation referred to the avian Clinic of Shahrekord University, Faculty of Veterinary Medicine. Abnormal stool symptoms were observed in clinical examinations. The appearance of feces was foul-smelling, bulky and popcorn-shape. The changes made in the appearance of the waste showed a kind of gastrointestinal dysfunction. Preliminary diagnostic work-up included water and food consumption, cloacal culture, fecal Gram's stain. All results were negative or within normal limits. On the basis of history, clinical signs and response to treatment, pancreatin insufficiency was diagnosed. the primary cause of pancreatitis in birds is often elusive. Possible causative and contributing factors include obesity, which is often present when the bird has been fed high-fat diets, metal poisoning, especially with zinc, mycotoxins, trauma, viral infection including PMV III, adenoviruses and avian influenza type A, infectious bronchitis and herpes virus, Chlamydophila infection, bacterial infections and neoplasia. Pancreatin drug was used for 1 months. After this period, complete recovery was observed in birds and droppings changed to a more normal color and quality. [ABSTRACT FROM AUTHOR]

Simple Summary: The escape of pets plays a significant role in the establishment of invasive species. In Japan, where most pet birds in households are foreign-origin species, one study examined the number of these birds that escaped into the wild. Information on pet bird escapes was gathered from online lost-and-found websites for pets between 2018 and 2021. Escape incidents occur daily, with Budgerigars and Cockatiels being the most common escapees. Despite being popular pets worldwide, these birds rarely establish themselves outside their natural habitats. Monk Parakeets, which briefly bred in the wild in Japan in the 1980s but failed to establish themselves, and the Rose-ringed Parakeet, already established as an invasive species in the Kanto region, have also occasionally been reported as escapees. Considering their global invasive presence, it is crucial to be vigilant in preventing pet birds from escaping to protect local ecosystems. Regular escape from commonly maintained species highlights the need for responsible pet ownership and heightened awareness to curb potential environmental impacts. The escape of pet birds into the wild raises concerns about the introduction of invasive avian species. This study investigated the impact of escaped pet birds on the introduction of non-native species in Japan. Data sourced from four lost-and-found pet websites between January 2018 and December 2021 revealed 12,125 recorded escapes exhibiting both daily occurrences and seasonal fluctuations. Statistical modeling identified the monthly average temperature (positively correlated) and maximum electricity demand (negatively correlated) as influential factors. Text analysis revealed "window" and "open" as frequently cited reasons for escapes. Budgerigars (Melopsittacus undulatus) and Cockatiels (Nymphicus hollandicus) accounted for 76% of the total escape, suggesting a low perceived risk of establishment in nonnative environments. Interestingly, two globally established invasive species, the Rose-ringed Parakeet (Psittacula krameri) and Monk Parakeet (Myiopsitta monachus), were among the escaped birds. While the Rose-ringed Parakeet is locally naturalized in Tokyo and its adjacent prefectures, the Monk Parakeet failed to establish itself in Japan. Despite the limited number of escaped Monk Parakeets, ongoing efforts are crucial for preventing the potential re-establishment of species with such capabilities. [ABSTRACT FROM AUTHOR]

Aim: Anticipating the ultimate fraction of a landscape that might be susceptible to invasion is challenging as several species are able to expand the range of environmental conditions used over invasion. Despite its relevance, the more proximate processes underlying observed shifts are not sufficiently understood. Habitat selection theory predicts that as population density increases, individuals start using sub‐optimal resources to compensate for the limitation of the preferred ones. However, niche shifts might also occur as result of changes in habitat preferences over time. Here, we tested these alternative hypotheses by investigating nesting resource use and selection over a biological invasion and the relative effect of density‐dependence on such patterns. Location: Barcelona, Spain. Methods: We take advantage of a large dataset recording the occurrence of the invasive monk Parakeet, Myiopsitta monachus in Barcelona in the period 1975–2015. We apply generalized linear models to analyse changes in nesting habitat preferences and its interactive effect with conspecific presence. Results: Temporal changes in nesting habitat use occurred. Palm species were the most commonly used nesting substrate since the beginning of the invasion but the diversity and frequency of use of other nesting substrates increased over time. Changes in nesting substrate use were consistent with a change in habitat selection, when accounting for habitat availability. Although a general role of conspecific aggregation on occupation patterns was found, it was mostly additive. That is, shifts in nesting substrate did not structure in relation to conspecific distribution. Conclusions: Shifts in nesting resource selection can occur during the spread stage of biological invasions, probably related to innovation and learning, rather than to optimal habitat selection. These shifts present a significant challenge for forecasting efforts and management. However, changes do not happen rapidly over time, highlighting that there is a management opportunity window before significant shifts occur. [ABSTRACT FROM AUTHOR]

Geographic differences in vocalizations provide strong evidence for animal culture, with patterns likely arising from generations of social learning and transmission. Most studies on the evolution of avian vocal variation have predominantly focused on fixed repertoire, territorial song in passerine birds. The study of vocal communication in open-ended learners and in contexts where vocalizations serve other functions is therefore necessary for a more comprehensive understanding of vocal dialect evolution. Parrots are open-ended vocal production learners that use vocalizations for social contact and coordination. Geographic variation in parrot vocalizations typically take the form of either distinct regional variations known as dialects or graded variation based on geographic distance known as clinal variation. In this study, we recorded monk parakeets (Myiopsitta monachus) across multiple spatial scales (i.e. parks and cities) in their European invasive range. We then compared calls using a multilevel Bayesian model and sensitivity analysis, with this novel approach allowing us to explicitly compare vocalizations at multiple spatial scales. We found support for founder effects and/or cultural drift at the city level, consistent with passive cultural processes leading to large-scale dialect differences. We did not find a strong signal for dialect or clinal differences between parks within cities, suggesting that birds did not actively converge on a group level signal, as expected under the group membership hypothesis. We demonstrate the robustness of our findings and offer an explanation that unifies the results of prior monk parakeet vocalization studies. [ABSTRACT FROM AUTHOR]

Background: The purpose of this study was to assess the pelvimetric values obtained from radiographic pelvis images of budgerigars in terms of sexual dimorphism. The objectives included determining linear osteometric and angle measurements of the pelvis, as well as calculating the length‐to‐width ratios among different pelvimetric measurements. Additionally, the study aimed to reveal the correlations between age and body weight with both the pelvimetric measurements and ratio measurements in these animals. Methods: In this study, measurements of linear distance, angle and length‐to‐width ratios were obtained from ventrodorsal images of the pelvis in a sample of 60 budgerigars, consisting of 30 males and 30 females. Subsequently, the statistical analysis of the obtained measurement values was performed. Results: When analysing the morphometric measurement values based on sex, it was observed that all linear measurements (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10 and L11) were higher in males, whereas the angle measurements (A1, LA2 and RA2) were found to be significantly greater in females (p < 0.05). Additionally, both male and female budgerigars exhibited a greater pre‐acetabular length of the ilium compared to the post‐acetabular length. Moreover, there were mostly positive significant correlations between age and body weight with the pelvic measurement values in both sexes (p < 0.05). Conclusions: The obtained biometric measurement values from pelvimetric X‐ray images in budgerigars were analysed to assess sexual dimorphism. Furthermore, this study presents fundamental morphometric data that can be valuable for clinical, taxonomic, phylogenetic, ornithological, allometric and characterization studies of budgerigars. [ABSTRACT FROM AUTHOR]

An adult individual of the Monk parakeet has been recorded in the City of Piraeus (SE Greece), a new unknown so far locality of the species. [ABSTRACT FROM AUTHOR]

The captivity and use of native psittacine birds is prohibited in Mexico. However, as these birds are among the groups most affected by illegal trafficking, they are commonly found as companion animals. Nevertheless, it is difficult to obtain information on their health. Therefore, a retrospective study was conducted of the clinical histories and necropsy reports of native psittacines that had been submitted to the Bird Disease Diagnostic and Research Laboratory of the Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, from 2006 to 2017. The lesions were classified according to type and anatomical location and the diseases were classified as infectious or non-infectious. During this period, 252 psittacines were submitted, the most frequent of which were the red-lored parrot (Amazona autumnalis), orange-fronted parakeet (Eupsittula canicularis) and scarlet macaw (Ara macao). The lesions were primarily located in the digestive and respiratory systems. By integrating the clinical histories and post-mortem findings, we concluded that nutritional disorders were the most frequent non-infectious diseases, systemic bacterial infections were the most frequent infectious conditions, the primary parasite was Sarcocystis spp and the most frequent neoplasm was multicentric lymphoma. [Display omitted] [ABSTRACT FROM AUTHOR]

Objective: This study was carried out to investigate the anatomical, morphometric, topographic, and histological features of the uropygial gland in adult male and female budgerigars (Melopsittacus undulatus). Material-Method: For this study, the uropygial glands of fourteen adult budgerigars (7 male, 7 female) were used in the study. This glandular structure located between the caudal vertebrae and pygostyle was removed by dissection. Morphological and histological characteristics of the dissected uropygial glands were determined. In addition, morphometric measurements and index calculations were performed. Tissue samples were taken to determine the histological structure of the gland, that were stained with Hematoxylin & Eosin (H&E), Masson Trichrome's and Periodic Acid Schiff-Alcian Blue. Result: In the study, it was determined that the gland structure was heart shaped and consisted of two lobes, a papilla and a draining duct system. Uropygial gland weight was determined as 1.57±0.96 g in male birds and 1.52±0.09 g in female birds. As a result of the statistical evaluation, there were significant differences between the sexes in the parameters of lobe width (p<0.05), papilla length and papilla width (p<0.01). Also, the GULI value had a statistically significant difference (p<0.05). Histological examination revealed that the gland had a two-lobed structure surrounded by a capsule composed of connective tissue. It was determined that the gland had a tubuloalveolar-holocrine structure and the epithelial layer consisted of cellular layers as germinative layer, intermediate layer, secretory layer and degenerative layer from the periphery to the centre. Conclusion: As a result of the study, it was determined that the morphological and histological structure of the uropygial gland in budgerigars showed similarities with other bird species as well as showing certain species-specific differences in general. [ABSTRACT FROM AUTHOR]

We compared the bird diversity of a managed (Rajdhani Jalashay) and an unmanaged wetland (Mustafapur) in Patna, Bihar, India. We recorded bird species by using point counts and fixed-route monitoring. At Rajdhani Jalashay, a total of 73 species were recorded, of which 15 species were winter visitors. Two species were in the Near-threatened category: Ferruginous Duck (Aythya nyroca) and Alexandrine Parakeet (Psittacula eupatria), while the others were of least concern. At Mustafapur wetland, 67 species were recorded with 11 species as winter visitors. Simpson's species diversity index was 0.78 at Rajdhani Jalashay, and 0.81 at Mustafapur wetland. The number of species of waders was 17 at Mustafapur wetland and 11 at Rajdhani Jalashay. The total number of Lesser Whistling-duck (Dendrocygna javanica), a resident bird was almost double (526) at Mustafapur wetland than that at Rajdhani Jalashay (234). The nitrate level was twice higher and the phosphate level was four times higher at Mustafapur wetland than those at Rajdhani Jalashay. The difference in species number and composition between the two wetlands may be attributed to the eutrophication resulting from high nitrate and phosphate levels at Mustafapur wetland. Unfortunately, the Mustafapur wetland is under threat due to human influences. The protection and sustainable management of natural wetlands is required for saving the biodiversity of the area. [ABSTRACT FROM AUTHOR]

Budgerigar fledgling disease (BFD) is a contagious disease caused by avian polyomavirus (APV) in psittacine birds and causes high mortality rates. Here, eight APV-positive cases were confirmed from dead parrots or parrot tissue samples by polymerase chain reaction (PCR). Full-length genome sequencing showed high nucleotide identity (98.84–100%) between the APV strains. Phylogenetic analysis revealed that two genogroups were cocirculating in South Korea. The nucleotide sequences of five strains, collected from different parrot species, were identical; however, pathological lesions were observed in only two parrots, both aged 2 months. Pathology included necrotic spots in the liver, subcutaneous haemorrhage, hepatomegaly, ascites, intranuclear inclusion bodies, hepatocyte karyomegaly, hepatic necrosis, and bile duct proliferation. This suggests that the pathogenicity of APV might be host age-dependent regardless of the host species. This study improves our understanding of APV pathogenicity and provides a more detailed genetic characterization of APV strains. RESEARCH HIGHLIGHTS Eight APV strains were identified in South Korea from 2019 to 2021. By phylogenetic analysis, South Korean APV strains were classified into two clades. [ABSTRACT FROM AUTHOR]

Zoonotic Cryptosporidium meleagridis was identified in invasive monk parakeets (Myiopsitta monachus) from Santiago metropolis in Chile. Oocysts were isolated from nestlings' faeces, and a fragment of 18S ribosomal RNA gene was amplified and sequenced. This finding emphasizes the importance of permanent pathogen monitoring in synanthropic species with wide global distribution. [ABSTRACT FROM AUTHOR]

The Rose-ringed Parakeet Alexandrinus krameri (Scopoli, 1769) firstly reported from Diyarbakır province, South-eastern Anatolia, Türkiye. The species have been identified in three different locations in Diyarbakır and totally, nine individuals have been determined between January 2021 and June 2022 periods. The records and observations of species were evaluated for the occurrence of species together with available data. Although no breeding has been detected so far, there are suitable habitats in Diyarbakır that will enable the species to breeding and establishing a new population. The species may be seen more widely in the near future due to the fact that the species is settled in the neighbouring provinces to the Diyarbakır. Rose-ringed Parakeet records were evaluated for Diyarbakır province where is species newly reported. This may allow us to estimate changes in population size and range expansion of species in this part of Türkiye in the future. Monitoring of the species is recommended to predict future effects of it on local fauna in this part of Türkiye. [ABSTRACT FROM AUTHOR]

A 2-year-old male budgerigar (Melopsittacus undulatus) died after a 1-day history of fracture of the rostral rhinotheca with pale mucous membranes, dyspnea, dull mentation, and ataxia. Histopathology revealed an infiltrative neoplasm composed of interweaving streams of spindle cells effacing the dermis and bone of the rostral upper beak as well as a ganglion and two cranial nerves. No visceral metastasis was observed. Neoplastic cells exhibited strong cytoplasmic immunolabeling for alpha-smooth muscle actin (α-SMA) and lacked immunolabeling for S100, Melan-A, PNL2, and cytokeratin AE1/AE3. These findings were consistent with a locally invasive leiomyosarcoma Leiomyosarcomas arise from the smooth muscle and are locally invasive with rare metastases. In birds, leiomyosarcomas are mostly reported to arise from the spleen, gastrointestinal, and reproductive tracts. In the case report herein, we describe the histological and immunohistochemical features of a primary beak leiomyosarcoma in a budgerigar associated with a fracture located at the rostral rhinotheca. Leiomyosarcoma arising from the beak has not been described in the literature.

Vocal production learning and beat perception and synchronization (BPS) share some common characteristics, which makes the vocal learning and rhythmic synchronization hypothesis (VLH) a reasonable explanation for the evolution of the capability for rhythmic synchronization. However, even in vocal learners, it is rare to see non-human animals demonstrate BPS to human music. Therefore, the first objective of this article is to propose some possible reasons why we do not see BPS in budgerigars, an excellent vocal learning species, while presenting some of my own findings. The second objective of this article is to propose a seamless bridge to connect the capability for vocal learning and BPS in locomotion. For this purpose, I present my own findings, wherein cockatiels spontaneously sang in synchrony with a melody of human music. This behavior can be considered a vocal version of BPS. Therefore, it can establish a connection between these two capabilities. This article agrees with the possibility that some mechanisms other than the vocal learning system may enable BPS, contrary to the original idea of VLH. Nevertheless, it is still reasonable to connect the capability for vocal learning and that for BPS. At the very least, the capability for vocal learning may contribute to the evolution of BPS. From these arguments, this article also proposes a scenario which includes vocalizing in synchrony as a driving force for the evolution of BPS and the capability for music production. [ABSTRACT FROM AUTHOR]

Proventricular dilatation disease (PDD) is a potentially fatal disease of psittacine birds. Avian bornavirus (ABV), the causative agent of PDD, causes inflammation of the central, peripheral, and autonomic nervous systems. Clinically, birds affected by PDD present with gastrointestinal tract dysfunction, neurological symptoms, or both. In this study, we evaluated the presence of proventriculus dilation and ABV in 40 birds (cockatiel, n = 12; budgerigar, n = 28), submitted to the veterinary clinic, by radiology and RT-PCR. Lateral and ventrodorsal radiographs and feather samples were taken from 36 live birds including the cockatiel and budgerigar, as well as samples of proventriculus from four autopsied birds. After reviewing the radiographs, 55.5% of the evaluated birds had proventriculus dilatation, and according to RT-PCR results, 47.5% of samples were positive. In most cases, radiology and RT-PCR results matched together very well, but in some cases, differences were observed. These discrepancies between the results of these two assays require further studies. Based on the results of this study, the prevalence of ABV was high in the region, and the importance of hygiene and testing of new birds should be emphasized. Simultaneous evaluation of the bird with these two methods is helpful for the diagnosis of PDD. [ABSTRACT FROM AUTHOR]

Introduction: The present study demonstrates that in the same brain area the astroglia can express GFAP (the main cytoskeletal protein of astroglia) in some species but not in the others of the same vertebrate class. It contrasts the former opinions that the distribution of GFAP found in a species is characteristic of the entire class. The present study investigated birds in different phylogenetic positions: duck (Cairina moschata domestica), chicken (Gallus gallus domesticus), and quails (Coturnix japonica and Excalfactoria chinensis) of Galloanserae; pigeon (Columba livia domestica) of a group of Neoaves, in comparison with representatives of other Neoaves lineages, which emerged more recently in evolution: finches (Taeniopygia guttata and Erythrura gouldiae), magpie (Pica pica), and parrots (Melopsittacus undulatus and Nymphicus hollandicus). Methods: Following a perfusion with 4% buffered paraformaldehyde, immunoperoxidase reactions were performed with two types of anti-GFAP: monoclonal and polyclonal, on floating sections. Results: The entopallium (formerly "ectostriatum," a telencephalic area in birds) was GFAP-immunopositive in pigeon and in the representatives of Galloanserae but not in songbirds and parrots, which emerged more recently in evolution. The lack of GFAP expression of a brain area, however, does not mean the lack of astroglia. Lesions induced GFAP expression in the territory of GFAP-immunonegative entopallia. It proved that the GFAP immunonegativity is not due to the lack of capability, but rather the suppression of GFAP production of the astrocytes in this territory. In the other areas investigated besides the entopallium (optic tectum and cerebellum), no considerable interspecific differences of GFAP immunopositivity were found. It proved that the immunonegativity of entopallium is due to neither the general lack of GFAP expression nor the incapability of our reagents to detect GFAP in these species. Conclusion: The data are congruent with our proposal that a lack of GFAP expression has evolved in different brain areas in vertebrate evolution, typically in lineages that emerged more recently. Comparative studies on GFAP-immunopositive and GFAP-immunonegative entopallia may promote understanding the role of GFAP in neural networks. [ABSTRACT FROM AUTHOR]

Habitat selection has profound consequences for individual fitness, but how do animals decide where to settle? The natal habitat preference induction (NHPI) hypothesis proposes that individuals choose habitats that exhibit similar environmental cues to those experienced in early life. In this study, we first examined juvenile movements and dispersal and then tested the NHPI hypothesis in the monk parakeet, Myiopsitta monachus , an invasive species that nests primarily in pine or palm trees in our study site. Juveniles were observed ranging extensively, but we found no relationship between ranging distances prior to dispersal and subsequent natal dispersal behaviour. As predicted by NHPI, we found that dispersed individuals displayed a significant preference for nesting in their natal tree type in their first year, irrespective of tree availability. The probability of changing tree type was not influenced by individual dispersal distance, the proportion of the natal tree type available or natal tree type. We found that adult birds undertaking breeding dispersal also showed a preference for the same tree type they dispersed from when making nest site selections, demonstrating that preferences can be maintained by adults during breeding dispersal movements. Finally, conspecific breeding success did not differ between palm and pine tree nests, and so did not provide a useful source of public information regarding the suitability of the two nesting substrates. These results contribute to our understanding of the drivers of habitat selection in both adults and juveniles and have implications for our understanding of dispersal patterns and range expansion in this worldwide invasive species. • Choice of breeding habitat by natal dispersers has important consequences. • Naïve animals must use cues to decide where to settle. • Imprinting on natal habitat features allows choice of successful habitat. • Dispersing parrots choose to nest in trees that match their natal tree. [ABSTRACT FROM AUTHOR]

Psittacid alphaherpesvirus 3 (PsAHV-3) is a rarely reported virus that has been associated with pneumonia in psittacine birds. A 5-mo-old Indian ringneck parakeet (syn. rose-ringed parakeet; Psittacula krameri) was euthanized after developing torticollis and lethargy. Postmortem examination of the parakeet revealed severe pneumonia with syncytial cells containing eosinophilic intranuclear inclusion bodies (INIBs) in the respiratory epithelium. Gene sequencing of total DNA extraction detected PsAHV-3 in the frozen lung. The pancreas had severe lytic necrosis, with the remaining parenchymal cells expanded by large basophilic INIBs. Electron microscopy of the pancreas revealed intranuclear paracrystalline arrays of viral particles morphologically resembling adenovirus. Although we found 3 PsAHV-3 cases in birds in a literature search, we found no cases with adenoviral coinfection. [ABSTRACT FROM AUTHOR]