The Imperial Eagle in the Republic of Khakassia and Krasnoyarsk Kray, Russia
Paper based on data of researches of authors in 2000-2010 and analyzed publications before 2000. While surveying the mountainous regions of Altai we found 215 Imperial Eagles (<i>Aquila heliaca</i>), 19 of which were adults or subadults, not connected to breeding territories, and 8 immature birds. We discovered 109 Imperial Eagle breeding territories (95 - in the Republic of Khakassia, 14 - in the Krasnoyarsk Kray), including 108 nests in 90 territories. A total of 279-345 pairs, (on average 312 pairs) of the Imperial Eagle are estimated to breed in the Russian part of Altai. Parameters of spatial distribution of nests, characteristics of nesting trees, reproductive parameters, breeding rate and diet are surveyed. The average clutch size was 2.13±0.64 eggs (<i>n</i>=15; range 1-3). The average brood size was 1.82±0.73 nestlings (<i>n</i>=17; range 1-3).