Barn Swallow

Hirundo rustica

Compiled by Lisa S. Graham

Graceful, agile, and endlessly energetic, the Barn Swallow is one of the most familiar birds of open country and rural landscapes. On summer days, these sleek aerial acrobats can be seen skimming low over fields, ponds, and pastures, twisting and turning with remarkable precision as they catch flying insects on the wing. Their glistening cobalt-blue backs, cinnamon-colored underparts, and deeply forked tails make them instantly recognizable, while their cheerful stream of twitters and chatters adds an unmistakable soundtrack to warm-weather days. 

Barn Swallows have developed a close relationship with people and are rarely far from human-made structures. While their ancestors once nested in caves and on natural cliff faces, today’s swallows typically build their homes under the eaves of barns, garages, bridges, culverts, and other sheltered structures. Their cup-shaped nests are remarkable feats of engineering, constructed from hundreds of pellets of mud mixed with dry grasses and lined with softer materials. Both the male and female participate in gathering materials and building the nest, often making repeated trips to nearby puddles or muddy shorelines. 

Family life begins when the female lays a clutch of four to five white eggs marked with brown speckles. Both parents share incubation duties, although the female typically spends more time on the nest. After about two weeks, the eggs hatch, and the real work begins. Barn Swallow parents are devoted caregivers, tirelessly catching insects throughout the day to feed their hungry nestlings. The young grow rapidly on this protein-rich diet and soon crowd the nest. Even after fledging, young swallows may continue to receive food and guidance from their parents as they learn the aerial skills needed to survive on their own. 

Watching Barn Swallows in flight is a lesson in efficiency and elegance. Their long, pointed wings and streamlined bodies allow them to make quick turns and sudden dives with little effort. They often forage in small groups, sweeping low over water or open fields where insects are abundant. As summer draws to a close, these birds gather into larger flocks and begin a remarkable migration, traveling thousands of miles to wintering grounds in Central and South America before returning north again in spring. 

Common and widespread, the Barn Swallow remains a welcome sign of the changing seasons. Its arrival each spring signals warmer days ahead, and its graceful flight and industrious family life continue to inspire admiration among birdwatchers and farmers alike. As long as open spaces, insects, and nesting structures remain available, the Barn Swallow will continue to be one of the most recognizable and beloved birds of the countryside. 

Interesting Facts

• The Barn Swallow is the most widespread and abundant swallow species in the world, breeding across much of the Northern Hemisphere and wintering throughout large portions of the Southern Hemisphere. 
• Barn Swallow parents sometimes receive help feeding their chicks from older offspring or even unrelated young birds, a behavior known as “helpers at the nest.” 
• An unmated male Barn Swallow may occasionally destroy the nestlings of another pair, which can cause the pair bond to break and create an opportunity for him to mate with the female. 

Compiled by Lisa S. Graham.  Sources include All About Birds (Cornell) and Audubon Field Guide.
Photo credit:  Jane Mann, Macaulay Library, Pauliina Saarinen, Mick Thompson