Bald Eagles on Amchitka Island, Alaska, were studied from 1969-1972. From 1970-1972 the population averaged 214.6 eagles. The average ration was 66% adults to 34% subadults. The eagles move to and from the island in relation to significant food sources (especially the garbage dump). An increase in active nests occurred from 1969-1972 due to an increase in food. The average percentage of nests containing young from 1970-1972 was 71.28%. During these three years, the average number of young known in a nest per nesting attempt was 1.24, and the average number of young known in a nest per nest containing young was 1.75. In 1972, .86 young fledged per nesting attempt, and 1.42 young fledged per nest fledging young. Prey remains from 1971-1972 averaged 23% mammalian, 61% avian, 14% fish, and 1% invertebrate as calculated by numbers. Bald Eagles were found to regularly prey on sea otter pups.
College and Department
Plant and Wildlife Sciences
BYU ScholarsArchive Citation
Sherrod, Steven K., "Biology of northern bald eagles (Haliaeetus leucocephalus alascanus) on Amchitka Island, Alaska" (1974). Theses and Dissertations. 7871.
Bald eagle; Birds, Alaska, Amchikta Island