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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.
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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.
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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.
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Olive-backed Pipit: Medium-sized pipit with finely streaked, olive-green upperparts. White underparts, chin, belly and undertail coverts. The sides and breast are pale brown with bold dark streaks. The eyebrow is buff-orange in front and white behind eye. The legs and feet are pink.
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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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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.
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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.
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Oriental Pratincole: Small, gray-brown wader-like bird with white belly, vent, and rump. White crescent below eye, black border to white-buff throat. Long gray-brown wings, red-brown wing lining. White tail with black band, long outer tail feathers. Sexes similar, winter adult and juvenile lack red on bill and have less black on head and throat.
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