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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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Bonaparte's Gull: Medium gull with black head and bill, gray back and wings, white underparts and tail. White outer primaries with black trailing edges are visible in flight. Legs are red-orange. Catches fish by wading and diving. Light and direct flight with rapid wing beat, ternlike.
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Sandwich Tern: Only medium-sized tern with long slender black bill tipped with yellow; upperparts are very pale gray, nearly white, and underparts are white. The black crown has a short black crest. White tail is deeply forked; legs and feet are black. Direct flight, hovers before diving for fish.
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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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Common Tern: Medium tern, medium gray upperparts, pale gray underparts, glossy black cap and nape. Wings are dark-tipped and have dark leading edge on forewing. Red bill is black-tipped. Legs are red and tail is deeply forked and elongated. Direct flight, hovers above water before diving for prey.
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Sooty Tern: Medium-sized tern with long wings, deeply forked tail, black crown, nape, and upperparts, and a broad triangular white forehead patch. Underparts are white; upper tail is black with white outer edges. Direct flight with strong, shallow wing beats. Hovers before dipping for prey.
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