Foraging Ecology of Bald Eagles in the Columbia River Estuary

We studied time budgets and foraging ecology of adult bald eagles (Haliaeetus leucocephalus) in the Columbia River Estuary from 1984 to 1986. Eagles spent most of their time perching (94%); of that time, loafing (54%), foraging (23%), and nesting activities (16%) were most frequently observed. Eagle...

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Bibliographic Details
Published in:The Journal of wildlife management 1991-07, Vol.55 (3), p.492-499
Main Authors: Watson, James W., Garrett, Monte G., Anthony, Robert G.
Format: Article
Language:English
Subjects:
Animal behavior
Animal, plant and microbial ecology
Biological and medical sciences
Bird nesting
Birds
Eagles
Ecology
Estuaries
Food
Foraging
Freshwater ecology
Freshwater fishes
Fundamental and applied biological sciences. Psychology
Haliaeetus leucocephalus
Ocean tides
Predation
Tidal flats
Waterfowl
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Summary:We studied time budgets and foraging ecology of adult bald eagles (Haliaeetus leucocephalus) in the Columbia River Estuary from 1984 to 1986. Eagles spent most of their time perching (94%); of that time, loafing (54%), foraging (23%), and nesting activities (16%) were most frequently observed. Eagles acquired food by hunting live prey (57%), scavenging (24%), and pirating (19%). Fish were the most important food and comprised 71% of prey remains. Catostomids, cyprinids, and fish
ISSN:0022-541X
1937-2817
DOI:10.2307/3808981