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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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Orange-crowned Warbler: Small warbler with olive-green upperparts and faintly streaked, yellow underparts. The head has inconspicuous orange crown, broken eye-ring, and faint eye-line. Though it lives and nests in dense foliage close to the ground, the male perches at the tops of tall trees to sing.
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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 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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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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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 Pratincole: Small, gray-brown wader-like bird with white belly, vent, and rump. White crescent below eye, black border to white-buff throat. Long gray-brown wings, red-brown wing lining. White tail with black band, long outer tail feathers. Sexes similar, winter adult and juvenile lack red on bill and have less black on head and throat.
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Oriental Plover: Small plover, white head, gray-brown on crown and back, black band separates orange-brown breast from white belly. Black, straight, medium bill. Pointed, gray-brown wings. Long, green-yellow legs and feet. Female, non-breeding male, and juvenile gray-brown above, buff edges to feathers and on face. White below and on front.
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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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