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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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.
Omao
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.
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.
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.