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Oak Titmouse: Medium-sized titmouse with pale, brown-tinged gray upperparts and paler face and underparts. The bill is small and black, and legs and feet are gray. Weak, fluttering flight. A recently formed species, and along with the Juniper Titmouse, was known as the Plain Titmouse until 1996.
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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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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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Orchard Oriole: Small oriole, black head, back, tail, and chestnut-orange shoulder patches, underparts, rump. Wings are black with single broad white bar; flight feathers have white edges. Feeds on insects, fruits, berries, nectar and flowers. Swift direct flight on rapid wing beats.
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Olive Sparrow: Medium-sized sparrow with olive-brown upperparts. Underparts are olive-gray on breast, sides, flanks and undertail coverts, and white on chin, throat and belly. Also has wide brown stripe on each side of crown and dark line through eye. Tail is rounded and dark brown.
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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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Olive Warbler: Medium warbler, gray back, rump, and uppertail coverts, and white belly and undertail coverts. Head, throat, nape and upper breast are orange-brown; mask is black. Wings are black, two broad white bars. Tail is notched and dark gray with white edges. Black legs, feet.
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Olive-backed Pipit: Medium-sized pipit with finely streaked, olive-green upperparts. White underparts, chin, belly and undertail coverts. The sides and breast are pale brown with bold dark streaks. The eyebrow is buff-orange in front and white behind eye. The legs and feet are pink.
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Omao: This common Hawaiian thrush is dark gray-brown above and pale gray below with brown edging on wings. It has a dark gray-black bill, eyes and legs. It feeds on a wide variety of fruits from understorey shrubs and trees. Alternates several rapid wing beats with wings pulled to sides. Has a curious habit of fluttering drooped wings similar to a young bird begging for food. Sexes are similar.
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Oahu Elepaio: This small monarch flycatcher has a dark brown crown and back, white underparts with buff flanks and breast, white lores, dark ear patch, rufous forehead, white-tipped black throat feathers, and white wing bars and rump. The long brown tail is white-tipped. It has a black bill, dark gray legs and feet. Feeds mainly on insects and spiders. Rapid and direct flight. Sexes are similar.
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Oriental Reed-Warbler: Small brown warbler with short crest, white-buff line above and in front of eye, white throat and breast, and white-buff on rest of underparts. Medium, gray-brown and brown-pink bill. Medium-length wings with brown-black flight feathers. Medium-length black-gray legs and feet. Sexes similar. Juvenile more red-brown.
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