San Diego County, California, US
Barn Swallow nest with five nestlings, San Antonio, Socorro Co., New Mexico, USA.
Barn Swallow on nest.
These are adults, despite the light underparts -- at least, 1 of them was carrying nesting material.
The Barn Swallow (Hirundo rustica) is the most widespread species of swallow in the world. It is a distinctive passerine bird with blue upperparts, a long, deeply forked tail and curved, pointed wings. It is found in Europe, Asia, Africa and the Americas. In Anglophone Europe it is just called the Swallow; in Northern Europe it is the only common species called a "swallow" rather than a "martin".