Barn Swallow is a species of bird that lives in cities. It lives on buildings and trees. During spring, they build nests along overpasses, and buildings. There they lay their eggs and it gives them protection from rain and wind. Swallows eat flying insects such as mosquitoes and flies. To catch their prey, Barn Swallows fly at top speed close to the ground and capable of turning on a dime. In certain regions, they only stay for breeding then migrate south during non breeding seasons.