- white-bellied swallow, tree swallow, Iridoprocne bicolor - bluish-green-and-white North American swallow; nests in tree cavities
--1 is a kind of swallow
- tree swallow, tree martin, Hirundo nigricans - of Australia and Polynesia; nests in tree cavities
--2 is a kind of swallow
--2 is a member of Hirundo, genus Hirundo