Treeswift
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 plumag, which is softer, and they have crests or other facial ornaments, and long forked tails. Anatomically they are separated from the true swifts by skeletal details in the cranium and palate, the anatomy of the tarsus, and a non-reversible hind toe which is used for perching on branches (an activity that true swifts are unable to engage in).
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