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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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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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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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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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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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