The treeswifts are closely related to the true swifts, but form a separate family, the Hemiprocnidae.
2.
The hummingbird evolutionary tree shows ancestral hummingbirds splitting from insectivorous swifts ( family Apodidae ) and treeswifts ( family Hemiprocnidae ) about 42 million years ago, probably in Eurasia.
3.
Traditionally, the bird order "'Apodiformes "'contained three living families : the swifts ( Apodidae ), the tree swifts ( Hemiprocnidae ), and the hummingbirds ( Trochilidae ).
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