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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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Vaux's Swift: Small swift, gray-brown body, sometimes highlighted by slight green iridescence. Rump is pale brown, throat and breast are nearly white. Bill, legs, feet are gray-black. Flight is low and fast, alternates bursts of quick fluttery wing beats with short glides. Catches insects in flight.
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