Encyclopedia > Apodiformes

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Traditionally the bird order Apodiformes contained three families: the swifts, Apodidae, the tree swifts Hemiprocnidae, and the hummingbirds Trochilidae.

In the Sibley-Ahlquist taxonomy, hummingbirds are separated from the Apodiformes as a new order Trochiliformes.

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