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Black Swift: Large, bulky swift, black overall. Wrist (wing angle) is very close to body. Long, slightly forked tail, often fanned out. It is the largest North American swift. Spends most of its time thousands of feet in the air. It flies on stiff, shallow wingbeats. Soars on thermals and updrafts.
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Chimney Swift: Medium-sized swift, uniformly dark brown with slightly paler throat and upper breast. Inconspicuous spines extend past web at tips of tail feathers. Bill, legs and feet are black. Flight is rapid and batlike on swept-back wings, alternates with gliding. Soars on thermals and updrafts.
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White-throated Swift: Medium-sized swift, mostly brown-black except for white throat, white patches on belly, flanks, white edges on wings. Face is pale gray, has dark eye patch. May be the most rapid flying North American bird, has been seen fleeing from raptors at estimated speeds of over 200 mph.
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