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The tropical Andes in South America stand at the top of the world's list of endemism hotspots, due to their high species richness per unit area. Thus, our study focuses on the Key Biodiversity Area (KBA) of the Utcubamba River (PER-84), one of the 96 KBAs, with an extension of 35,534 hectares. This area is located in northwest Peru, within the hotspot of the tropical Andes. The study area is well known as the waterfalls valley, which holds the world's third highest waterfall "Gocta", an outstanding national and international tourist attraction. Nevertheless, despite its great ecological and tourist value, research reports are deficient in the area. Therefore, we conducted a biological inventory in 2019 during the wet season, with the aim of recording and identifying species of tetrapod fauna, as well as promoting actions for their conservation. Based on field assessments, the following number of species was recorded: amphibians (14), reptiles (6), birds (229), and mammals (20). Interestingly, for the first time, two species of amphibians (Gastrotheca aguaruna and Gastrotheca spectabilis) and two reptiles (Dipsas palmeri and Tachymenis affinis) have been recorded; furthermore, the following several endemic species have been observed: amphibians (3), reptiles (2), birds (3) and mammals (1) that have not yet been reported for the ACB, which have not yet been reported for the KBA. This finding, in fact, increases the number of species of endemism in this part of Peruvian territory. Consequently, this study aims to be the basis for promoting further research to discover new species for science and to propose strategies for their conservation over time. [ABSTRACT FROM AUTHOR]