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Fieldfare: Large, robin-like thrush with rufous back with gray head and rump. Underparts are brown-barred white on breast and sides, and white on belly. Wings are rufous. Tail is dark gray to black. The bill is yellow with a dark tip. Strong and fast flight on rapidly beating wings.
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Flesh-footed Shearwater: Large, bulky shearwater with dark brown body, darker head and tail. Bill is large and pink with a dark tip. Wings are dark with brown-edged coverts that become paler with wear. Legs and feet are pale pink. Slow flight, alternates stiff-winged flapping and gliding near water.
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Far Eastern Curlew: Largest curlew, very long, decurved bill, longest of any shorebird. Dark brown with heavily streaked underparts. Blue-gray legs, feet. Eats crustaceans, marine worms, insects, larvae, invertebrates. Strong steady flight, rapid wing beats. Flies in straight line or V formation.
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Fea's Petrel: Medium petrel, gray-brown upperparts, white belly. White breast with partial gray-brown breast band. Wings bend back at the wrist, have a dark M pattern across upperwings and lower back. Underwings are mostly dark. White face, dark mask around eyes. Gray tail, pale uppertail coverts.
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Fork-tailed Swift: Large swift, brown-black overall with white throat and rump, scaled belly, and long, deeply forked tail. Bill is black, legs and feet are gray-black. Rapid flight on stiff, quickly beating swept-back wings, alternating with gliding flight. Catches insects midflight.
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Fox Sparrow: Large sparrow, varies from dark or gray-brown in the west, rufous in the east; upperparts may be so dark that back pattern is hard to see. Heavily streaked upperparts, converging at midbreast into a large, dark spot. Rust-brown tail. Bill has dark upper mandible, yellow lower mandible.
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Field Sparrow: Medium sparrow, rufous back with dark streaks, unstreaked, buff breast. Gray-brown rump. Gray head, rufous cap, and white eye-ring. Pink bill, legs and feet. Forages on ground or low shrubbery. Short flights, alternates rapid wing beats with brief periods of wings pulled to the sides.
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Ferruginous Pygmy Owl: Small owl, plain brown upperparts, white underparts with thick, brown streaks. Round head has stripes and no ear tufts. Nape has two conspicuous black patches outlined in white. Tail is long and rufous with dark brown bars. Flight is rapid and direct with unmuffled wing beats.
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Ferruginous Hawk: Large hawk, white head, streaked, rust-brown shoulders, back, and feathered legs. Underparts have scattered rufous streaks. Gray-brown wings. Tail is white with rust-brown wash. Dark morph is red-brown with white flight feathers. Alternates deep flaps and glides, soars on thermals.
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Flammulated Owl: Small owl with two color morphs (gray-brown and rufous) with many intermediate forms. The head has very small ear tufts, and dark eyes surrounded by rust-brown, pale-gray facial disk, and white eyebrows that start at the bill. It is the only small owl with dark, not yellow, eyes.
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Fulvous Whistling-Duck: Large, long-legged, long-necked duck with dark brown back and white V-shaped rump patch. Head and underparts are buff with white throat and vent. The white-edged side and flank feathers form a striking border between sides and back. Tail is black with white undertail coverts.
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