Tips for using Browse:

Browsing is a valuable way to learn about birds, however it is a brute force approach and not designed for identification. A more sophisticated approach to finding a bird with specific field marks is to use the Step by Step Search. You can also try the Wizard to find a bird, which uses a question and answer approach, but again it does not give you the flexibility of the Step by Step Search.
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Oriental Cuckoo
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.
Oriental Turtle-Dove
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.
Orange-winged Parrot
Orange-winged Parrot: Medium green parrot, yellow head, broad blue eyebrow. Small red-orange patch in secondary feathers while perched and in flight. Green tail has yellow to orange base in outer feathers. Hooked bill is dull yellow with a dark tip. Legs and feet are gray.
Olive Warbler
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.
Oriental Greenfinch
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.
Omao
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.
Oahu Elepaio
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.
Oahu Amakihi
Oahu Amakihi: This small honeycreeper has yellow-green upperparts, yellow throat, breast, and belly, black lores, decurved gray bill and gray legs and feet. Females are gray-green above and yellow-white below with two pale wing-bars. Diet includes nectar, insects and spiders. Strong and direct flight in canopy, may undulate over long distances.
Olive-sided Flycatcher
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.
Orange-crowned Warbler
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.
Oak Titmouse
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.
Orchard Oriole
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.
Olive Sparrow
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.
Ovenbird
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.