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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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Franklin's Gull: Medium gull, gray back, white underparts. Head is black, white eye-ring; bill is orange, black spot near tip. Wings are short with white-bordered or spotted black tips. The legs are red-orange. Strong direct flight with deep wing beats. Soars on thermals and updrafts.
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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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Fork-tailed Flycatcher: Medium-sized flycatcher with pale gray upperparts, black head, inconspicuous yellow crown stripe, and white underparts. Wings and spectacularly long, deeply forked tail are black. Wing linings are white. Swift flight with shallow wing beats. Feeds on insects.
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Fish Crow: Medium-sized crow with black body and dark, heavy bill. Very similar to American Crow, but call is different. Feeds on fish, crustaceans, carrion, eggs, insects, larvae,fruits and berries. Flies on stiff wing beats, alternates several rapid wing strokes with long glides.
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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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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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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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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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