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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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.
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.
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 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.
Osprey
Osprey: Large raptor, dark brown upperparts contrast with white underparts, faint breast band. Small, white head has dark crown, eyestripe. Dark bill. Wings held at a distinct angle in flight, with underwing showing barred flight feathers and diagnostic dark patches on forewing. Gray legs and feet.
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.
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.