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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 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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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-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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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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