The bald eagle ( Haliaeetus leucocephalus , from Greek hali "sea", aiētos " eagle ", leuco "white", cephalos "head") is a bird of prey found in North America . A sea eagle , it has two known subspecies and forms a species pair with the white-tailed eagle ( Haliaeetus albicilla ). Its range includes most of Canada and Alaska, all of the contiguous United States , and northern Mexico. It is found near large bodies of open water with an abundant food supply and old-growth trees for nesting. The bald eagle is an opportunistic feeder which subsists mainly on fish , which it swoops down and snatches from the water with its talons. It builds the largest nest of any North American bird and the largest tree nests ever recorded for any animal species, up to 4 m (13 ft) deep, 2.5 m (8.2 ft) wide, and 1 metric ton (1.1 short tons ) in weight. [2] Sexual maturity is attained at the age of four to five years. Bald eagles are
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