Greater and lesser scaup are often found together, but the larger size of the greater scaup is very obvious. Male greater scaup also have a larger, more round, green-tinted head than male lesser scaup. Male greater scaup have a glossy black head tinted green. The neck, breast and upper mantle are glossy black, and the flanks and belly are white, sometimes with gray vermiculation’s on the lower flanks. The back is whitish with fine black vermiculation’s, and the tail and upper- and under-tail coverts are black. The wing has a broad white speculum spanning nearly the entire length of the primaries and secondaries. The bill is a light blue-gray with a black nail, the legs and feet are gray and the iris is yellow. Female greater scaup are brown with white oval patches around their bills. The female’s bill is similar to that of the male, but slightly duller, and the legs and feet are gray.
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