Bald Eagle Identification, All About Birds, Cornell Lab of Ornithology
The Bald Eagle has been the national emblem of the United States since 1782 and a spiritual symbol for native people for far longer than that. These regal birds aren’t really bald, but their white-feathered heads gleam in contrast to their chocolate-brown body and wings. Look for them soaring in solitude, chasing other birds for their food, or gathering by the hundreds in winter. Once endangered by hunting and pesticides, Bald Eagles have flourished under protection.
It takes bald eagles about five years to obtain their white head! These pictures are of the same bird taken years apart, illustrating the difference between juvenile and subadult plumage. Source .
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Bald Eagle Overview, All About Birds, Cornell Lab of Ornithology