Barn Swallows in Wisconsin
This bird is commonly seen in rural areas and semi-open country skimming low over fields with a flowing, graceful flight. They frequently seek refuge in buildings, and therefore, they may be considered a nuisance. They are protected under the Federal Migratory Bird Act.
Barn Swallows Diet
Food is mostly captured and eaten in the air, often foraging quite low over water or fields. They feed on a wide variety of flying insects, including flies, beetles, wasps, bees, winged ants, and true bugs. Moths, damselflies, grasshoppers, other insects, and occasionally a few berries or seeds are also eaten.
Barn Swallow Habitat & Nesting
Although it is becoming increasingly rare to find a barn swallow nest in a site that is not man-made, natural nesting sites are in sheltered crevices in cliffs or shallow caves. Nests are more commonly found in open buildings, under eaves, under bridges or docks, barns, sheds, or similar places. The nest is built in the shape of a cup with mud and dried grass and is lined with feathers.
Barn Swallow Mating & Life Cycle
Courtship involves aerial chases. When perched, mated pairs sit close together, touch bills, and preen each other’s feathers. Several pairs may nest in the same immediate area, but do not form dense colonies like some other swallow species.
Barn swallows have one to two broods per year with four to five white eggs each. The eggs are incubated by both sexes for 13-17 days. Both parents feed the young, and occasionally, one or two additional birds (offspring from previous broods) may attend the nest and feed the nestlings. Young leave the nest about 18-23 days after hatching.
Barn Swallow Damage
Swallows can damage property with their mud nests, which are not only unattractive but can permanently damage the surfaces on which they are built. Their droppings that fall under the nests may breed bacteria and parasites causing major health concerns, requiring expensive and time-consuming clean-up and repair.