A "swallow" is a type of small bird belonging to the family Hirundinidae. These birds are known for their long wings and forked tails, which help them fly swiftly and gracefully. Swallows are often seen in open areas, where they catch insects in mid-air. They are migratory birds, traveling long distances between breeding and wintering grounds. Swallows build their nests using mud and plant materials, typically in sheltered locations like under eaves or cliffs. They are social birds, often seen in flocks, and are known for their distinctive chirping sounds. Their presence is often associated with warm weather and the arrival of spring.