Ключевое слово: «anthropogenic impact»

The Falcipennis falcipennis is among the rarest and least-studied grouse birds of the Russian Far East. A distinctive anatomical trait of the species is the pronounced tapering of the outer primary feathers – a feature reflected in its binomial nomenclature. Behavioral observations indicate that this bird is highly sedentary, primarily terrestrial in locomotion, and exceptionally cryptic. Vocalizations are exceedingly rare, rendering it one of the least acoustically active avian species in the taiga ecosystem. Notably, the Falcapennis falcapennis exhibits minimal flight response to human presence; individuals typically retreat slowly on foot or ascend to the nearest conifer without displaying overt agitation. Despite this apparent tameness, the species demonstrates extreme sensitivity to anthropogenic disturbance. The present study aims to refine the current understanding of the species’ distribution in southern Yakutia, assess the condition of its key habitats, and identify limiting factors affecting its range.