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A long-standing mystery in paleontology is why we have discovered thousands of eggs from some types of dinosaurs, such as the duck-billed hadrosaurs, but none at all from other types [...]

Some wood duck hens lay eggs in nests that aren't theirs, while others stay at home. The behavior isn't simply cooperative or a con job. It's complicated in the duck [...]

The Mexican Woodnymph (Eupherusa ridgwayi) is endemic to west-central Mexico with a narrow distribution range and relatively small population size. The species nest, nesting activities and nestling's characteristics were unknown until now. We generated a map of this species using data from BirdLife International, the Global Biodiversity Information Fund database, e-Bird, and the Naturalista. We used the Mexican Woodnymph records in Jalisco and projected them on a vegetation map. We documented a female constructing a nest, later nesting, until the nestlings flew out of the nest in the cloud forest in central-western Mexico: Jalisco state. The nest site was characterized and the materials used for the nest construction were determined. In addition, we documented several observations made on territorial and foraging behavior., INTRODUCTION Eupherusa is the monophyletic genus of tropical hummingbirds in the family Trochilidae (Schuchmann, 1999). It comprises five recognized species, namely, Eupherusa poliocerca (White-tailed Hummingbird), Eupherusa cyanophtys (Blue-capped Hummingbird), Eupherusa [...]