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Horned Grebe: Small grebe, red-brown neck, breast and flanks, nearly black throat and back. Head has black cap, white face, conspicuous buff-orange to yellow ear plumes. Bill is dark with white tip, eyes are dark red. Feeds on aquatic insects, fish and crustaceans. Direct flight on rapid wing beats.
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Harlequin Duck: Small diving duck, blue-gray upperparts and underparts, rust-brown flanks. Back, breast and neck have vivid black-bordered white bars. Tail is dark and relatively long. Gray legs, feet. Feeds on insects, mollusks and crustaceans. Rapid direct flight, often low over the water.
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Hooded Merganser: This small merganser has black upperparts, white underparts with two black bars on side of breast, and red-brown flanks. The crest shows a large white patch when raised; white stripe extends backwards from eye when lowered. Feeds on fish and aquatic insects. Dark wings have white shoulder patch visible in flight. Rapid direct flight with fast wing beats. Sexes are similar.
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Herring Gull: This large gull has a pale gray back, black-tipped wings, a white head, neck, breast, tail and underparts. The bill is yellow with a red spot near the tip; legs are pink. Diet includes marine invertebrates, fish and insects. It has a strong steady flight with deep wing beats and soars on thermals and updrafts. The males are larger than females; the sexes have similar plumage.
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Hawaiian Duck: This small dabbling duck is mostly mottled brown, buff and black; uniformly gray-brown on the throat, nape and head. Its blue-green speculum is bordered by white. It has a gray spatula shaped bill and orange legs. The males are larger than the females but similar in appearance. It feeds on aquatic insects, crustaceans, seeds and plant matter. Its flight is fast and direct.
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Hawaiian Moorhen: This moorhen is a subspecies of the Common Gallinule. This dark gray bird has a black head and neck and white feathers on the flanks and under tail coverts, a very distinctive red frontal shield; bill tip is yellow with a red base, and the legs and feet are greenish, without lobes. It feeds on insects, plants and mollusks. It has a swift strong direct flight. Sexes are similar.
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