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Forster's Tern: Medium tern, pale gray upperparts, black cap, white underparts. Bill is orange, black tip. Wings are pale gray with paler primaries. Tail is pale gray, deeply forked with dark inner edge, white outer edge. Orange legs, feet. Hovers above water before diving for prey.
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Five-striped Sparrow: Medium sparrow, dark, gray-brown upperparts, gray underparts, white belly. Head has thin white eye-line and eye-ring, and black-and-white throat stripes. Pink-gray legs, feet. Short flights, alternates rapid wing beats with brief periods of wings pulled to sides.
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Fan-tailed Warbler: Small, secretive warbler, dark gray upperparts, red-brown underparts, white-tipped tail. Head has yellow throat and small crown patch, white eye crescents. Walks on the ground rather than hop. Undertail coverts are white. Short, weak flight on rapidly beating wings.
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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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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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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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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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