Apodiformes

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Apodiformes (swifts, tree swifts, humming-birds; class Aves) An order of birds all of which have a short, thick humerus, a short ulna, and short secondary feathers. They are high-speed fliers. The order comprises three families. Trochilidae (humming-birds) are placed in a different suborder from Apodidae (swifts) and Hemiprocnidae (tree swifts).

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Apodiformes

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