Herniprocnidae

The tree swifts or crested swifts are aerial near passerine birds, closely related to the true swifts. They are restricted to southeast Asia and Australasia.

They differ from the other swifts in that they have crests, long forked tails and softer plumage. The males have iridescent mantle plumage.

These are birds of open woodland which, like all swifts, have life styles based on catching insects in flight. They lay one grey egg in the nest, which is glued to an open tree branch.

The species are:

• Crested Treeswift, Hemiprocne coronata
• Gray-rumped Treeswift, Hemiprocne longipennis
• Whiskered Treeswift, Hemiprocne comata
• Moustached Treeswift, Hemiprocne mystacea