The
Apodiformes /ˈæpədɪfɔːrmiːz/ is an order, or taxonomic grouping, of birds which traditionally contained three living families—the
Apodidae (swifts), the
Hemiprocnidae (treeswifts), and the
Trochilidae (hummingbirds); however, in the Sibley-Ahlquist taxonomy, this order is elevated to the superorder
Apodimorphae, in which hummingbirds are separated into a new order, the
Trochiliformes. With nearly 450 species identified to date, it is the most diverse
(Wikipedia)