See text The bird genus Hirundo is a group of passerines in the family Hirundinidae (swallows and martins).

Many of this group have blue backs, red on the face and sometimes the rump or nape, and whitish or rufous underparts.

The genus Hirundo was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae.

The linear sequence is based on two molecular phylogenetic studies published in 2005 and 2018.

[6][7][8] There are at least two fossil species included in this genus: Some authorities, either presently or formerly, recognize several additional species as belonging to the genus Hirundo including: All of the species are found in the Old World, although one, the barn swallow, is cosmopolitan, also occurring in the Americas.