The purpose of this paper is to provide additional information on the non-Passerine bird fauna and populations in the Bolsherechensky Nature Reserve, specifically within the Bolshaya Rechka River valley. Located in Altai Krai, the reserve occupies a typical territory of the Upper Ob forest massif. Protecting the habitats of rare and endangered bird species is one of the primary goals of the reserve. However, despite previous studies, our understanding of the avifauna and bird populations remains insufficient. To address this, we conducted bird surveys in the reserve during spring and summer of 2012, 2013, 2017, and 2021, specifically within the Bolshaya Rechka River valley. The results revealed that the summer breeding community of non-Passerine birds in the Bolsherechensky reserve consists of 48 species from 18 families and 12 orders. Additionally, we discovered 11 rare and endangered bird species previously unrecorded in the reserve. In particular, seven of these species lack specific distribution information in the latest regional Red Data Books, including the Black stork (Ciconia nigra), Oriental honey buzzard (Pernis ptilorhynchus), Peregrine falcon (Falco peregrinus), Red-footed falcon (Falco vespertinus), Common wood pigeon (Columba palumbus), Eurasian pygmy owl (Glaucidium passerinum), and European bee-eater (Merops apiaster). In general, our study significantly improves our knowledge of the non-Passerine bird fauna and population of non-Passerine birds in the lower reaches of the Bolshaya Rechka River within the Bolsherechensky Nature Reserve. The findings are valuable for the improvement of biodiversity protection measures.

The authors express their gratitude to A. Gribkov and L. Pozhidaeva for their financial and technical support in organizing the field studies. The authors also thank R. Bakhtin, V. Kozil, student N. Kolotov and high school student A. Bespalov for their assistance during the expeditions. Financial support for the study was provided by the Global Greengrants Fund in 2012 (the project "Save the feathered raptors of the Upper Ob boron!") and "Lash-Rasha" LLC in 2017.