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Oriental Greenfinch: Medium finch with dark gray-brown upperparts, brown underparts, yellow undertail coverts. Face, breast, rump are olive-green; cap, nape are gray. Bill is pink. Dark wings have white-edged feathers and large yellow patches. Black tail has yellow on outer feathers.
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Oma'o: Most common of the Hawaiian thrushes, dark gray-brown above and pale gray below with brown edging on wings. Bill and legs are dark gray-black. Has a curious habit of fluttering drooped wings similar to a young bird begging for food.
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Oahu Elepaio: Small monarch flycatcher. Crown and back are dark brown, white underparts with buff flanks and breast. White lores, dark ear patch, rufous forehead. Black throat feathers have white tips. Wingbars, rump are white, long brown tail is white-tipped. Black bill, dark gray legs and feet.
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Oriental Turtle-Dove: Large, stocky dove, buff-brown overall with scaled pattern on back and wings produced by black feathers with buff, gray, or red fringes. Has distinctive black-and-white patch on neck. Tail is long, gray, and white-tipped. Legs are red. Strong swift direct flight.
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Olive-sided Flycatcher: Large, heavy-billed flycatcher with dark olive-brown upperparts, streaked olive-brown sides, and white underparts. Head has slight crest and faint white eye-ring. Wings are dark with two pale bars. Dark tail is relatively short, broad, and slightly notched. Black legs, feet.
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Osprey: Large raptor, dark brown upperparts contrast with white underparts, faint breast band. Small, white head has dark crown, eyestripe. Dark bill. Wings held at a distinct angle in flight, with underwing showing barred flight feathers and diagnostic dark patches on forewing. Gray legs and feet.
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Ovenbird: Medium, ground walking warbler, olive-brown upperparts, heavily spotted white underparts. Head has dull orange central crown stripe edged in black, and a white eye-ring. Wings, tail are olive-green. Name is from its covered nest, the dome and side entrance make it resemble a dutch oven.
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