It breeds in North America and Mexico, and is migratory, wintering in southern South America. This species is a very rare vagrant to western Europe.
These birds average 5 inches long with a tiny bill.
The adult has an iridiscent blue back and crown, brown wings and tail, and buff rump. The nape and forehead are white. The underparts are white except for a red face. The tail is square-ended.
Young birds are essentially brown above and whitish below, except for the buff rump and dark face.
Cliff Swallows breed in large colonies. They build conical mud nests and lay 3-6 eggs.
The natural nest sites are on cliffs, preferably beneath overhangs, but as with the Eurasian House Martin, man-made structures are now the principal locations for breeding.
Female Cliff Swallows are known to lay eggs in and move previously laid eggs into the nests of other birds within the colony.
This species has always been plentiful in the west of North America, where there are many natural sites, but the abundance in the east has varied.
European settlement provided many new nest sites on buildings, but the population declined in the late nineteenth and early twentieth centuries as the supply of unpainted barns declined. There has been a subsequent revival as dams and bridges have provided suitable sites. These are the famous swallows that return every year to the
Diet / Feeding:
Like all swallows and martins, Cliff Swallows subsist primarily on a diet of insects which are caught in flight.
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