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Tree Swallow: Medium-sized swallow with iridescent blue-green upperparts and white underparts. The wings are dark gray and tail is dark and forked. Black bill, legs and feet. Swift, graceful flight, alternates slow, deep wing beats with short or long glides. Turns back sharply on insects it passes.
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Violet-green Swallow: Small swallow, dark, metallic green upperparts, iridescent purple rump. Face, sides of rump, underparts are white. Tail is slightly forked. Black bill, legs and feet. Swift, graceful flight, alternates several quick wing beats with long glides. Soars on thermals and updrafts.
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Bank Swallow: Small swallow with brown upperparts, and a brown breast band seperating white underparts from white throat and chin. Tail is notched. Brown legs, feet. The smallest North American swallow. Swift, erratic flight, alternating several shallow, rapid wing beats with short to long glides.
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Cliff Swallow: Small, stocky swallow, dark blue-gray upperparts, pale orange-brown rump, buff underparts. Forehead is white or buff while throat, sides of face are orange-brown. Crown is blue-black, bill is short and black. Tail is dark and squared. Legs and feet are gray. Catches insects in flight.
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Northern Rough-winged Swallow: Small, stocky swallow, brown upperparts, paler underparts, pale brown throat. Tail is squared with white undertail coverts. Named for tiny hooks found on outer primary feathers. Swift, graceful flight, alternates several slow, deep wing beats with short or long glides.
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