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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 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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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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Orange Bishop: Small weaver finch with bright orange-red body and black belly. The head has a black crown, face, and bill and the wings are brown. Orange-red uppertail coverts are very long and extend over the short, brown tail. Native to sub-Saharan Africa. AKA Orange Weaver Finch.
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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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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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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.
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