The order Apodiformes, consists of about 450 species of swifts and hummingbirds.
Cite this Page: Chamberlain, H. 2009. "Hummingbirds"
(OnLine) UntamedScience. Accessed Jul 29, 2010 at http://www.untamedscience.com/biodiversity/animals/chordates/birds/hummingbirds