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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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Orange Bishop: Small weaver finch with bright orange-red body and black belly. The head has a black crown, face, and bill and the wings are brown. Orange-red uppertail coverts are very long and extend over the short, brown tail. Native to sub-Saharan Africa. AKA Orange Weaver Finch.
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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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Oahu Amakihi: Small honeycreeper with yellow-green upperparts. Yellow throat, breast, and belly, becomes dull towards flanks and vent. Face has black lores. Gray bill is decurved. Legs and feet are gray. One of the least specialized and most adaptable Hawaiian species.
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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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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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Orange-winged Parrot: Medium green parrot, yellow head, broad blue eyebrow. Small red-orange patch in secondary feathers while perched and in flight. When fanned out the tail shows pretty blue, orange, yellow, and green highlights. Hooked bill is dull yellow with a dark tip. Legs and feet are gray.
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Oriental Cuckoo: Medium-sized cuckoo with gray upperparts, gray throat, and distinctly barred breast. Wings and long tail are dark gray. Bill is decurved and yellow with dark tip. Feeds on caterpillars, insects and their larvae. Flies low to the ground, holds wings low during 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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Orange-crowned Warbler: Small warbler with olive-green upperparts and faintly streaked, yellow underparts. The head has inconspicuous orange crown, broken eye-ring, and dark 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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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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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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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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