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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-collared Swift: Very large swift, gray-black overall with blue gloss on breast and back. White collar is distinct. Bill, legs and feet are black. The flight is strong and fast. Rapid shallow wing beats followed with long glides. Soars on thermals and updrafts, ranging many miles daily to feed.
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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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