Traditionally the bird order Apodiformes contained three families: the swifts, Apodidae, the tree swiftsHemiprocnidae, and the hummingbirdsTrochilidae.
In the Sibley-Ahlquist taxonomy, hummingbirds are separated from the Apodiformes as a new order Trochiliformes.
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... with them, 45.9% are married couples living together, 8.2% have a female householder with no husband present, and 42.6% are non-families. 29.5% of all households are ...