Treeswifts are small to medium-sized swifts, ranging in length from 15–30 cm. They have long wings, with most of the length coming from the length of the primaries
; their arms are actually quite short. They visibly differ from the other swifts in matters of plumage
, which is softer, and they have crests or other facial ornaments, and long forked tails.
From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Treeswift