Feeding Behavior

Food is mostly captured and eaten in the air. Often forages quite low over water or fields. In bad weather, may sometimes feed on the ground.

Eggs

4-5, sometimes 6, rarely 7. White, spotted with brown. Incubation is by both sexes (female does more), 13-17 days. Young: Both parents feed young. One or two additional birds, the pair's offspring from previous broods, may attend the nest and sometimes feed the nestlings. Young leave the nest about 18-23 days after hatching. 1 or 2 broods per year.

Young

Both parents feed young. One or two additional birds, the pair's offspring from previous broods, may attend the nest and sometimes feed the nestlings. Young leave the nest about 18-23 days after hatching. 1 or 2 broods per year.

Diet

Insects. Feeds on a wide variety of flying insects, especially flies (including house flies and horse flies), beetles, wasps, wild bees, winged ants, and true bugs. Also eats some moths, damselflies, grasshoppers, and other insects, and a few spiders and snails. Only occasionally eats a few berries or seeds.

Nesting

Courtship involves aerial chases. On perch, mated pair sit close together, touch bills, preen each other's feathers. Several pairs may nest in same immediate area, but does not form dense colonies like some swallows. Nest: Original natural sites were in sheltered crevices in cliffs or shallow caves. Sites used today are mostly in open buildings, under eaves, under bridges or docks, or similar places. Nest (built by both sexes) is a cup of mud and dried grass, lined with feathers.