| any of several birds of the family Hemiprocnidae, of southeast Asia and the East Indies, related to the true swifts but differing in having erectile crests and the habit of perching in trees. |
tree swift
(family Hemiprocnidae), any of three or four species of fork-tailed forest birds ranging from Southeast Asia and Australia to the Solomon Islands.
Learn more about tree swift with a free trial on Britannica.com.