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Falcated Duck: Medium dabbling duck with long black and white tertial feathers extending over black rump. Body white, black, gray in finely-scaled pattern. The crested iridescent head is green and purple-brown. White throat has black ring; black tail and black-green speculum are edged in white.
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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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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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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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