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Osprey: This large raptor has dark brown upperparts, white underparts, faint breast band, small white head with dark crown, eye stripe and bill, gray legs and feet. Wings held at a distinct angle in flight, under wing showing barred flight feathers and diagnostic dark patches on the fore wing. Soars on thermals, deep slow wing beats alternating with glides. Feeds mainly on fish. Sexes similar.
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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 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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Oriental Plover: Small plover, white head, gray-brown on crown and back, black band separates orange-brown breast from white belly. Black, straight, medium bill. Pointed, gray-brown wings. Long, green-yellow legs and feet. Female, non-breeding male, and juvenile gray-brown above, buff edges to feathers and on face. White below and on front.
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Oriental Reed-Warbler: Small brown warbler with short crest, white-buff line above and in front of eye, white throat and breast, and white-buff on rest of underparts. Medium, gray-brown and brown-pink bill. Medium-length wings with brown-black flight feathers. Medium-length black-gray legs and feet. Sexes similar. Juvenile more red-brown.
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Osprey (Palau): Large raptor with dark brown upperparts and contrasting white underparts; faint breast band, speckled brown necklace. Intensity varies based on sex and race, males usually less marked. Small white head has dark crown and eye stripe. Bill is dark. Wings are held at a distinct angle in flight; underwing shows barred flight feathers. Wings are fairly long and narrow; wing bends back at carpal joint, giving characteristic shallow V-shape. Legs and feet are gray. Sexes are similar. Juvenile has scaled upperparts, less marked breast band.
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