Swallows are small, agile birds known for their graceful flight and distinctive forked tails. They belong to the family Hirundinidae and are found on every continent except Antarctica. Swallows primarily feed on insects, which they catch in mid-air, making them important for controlling insect populations. Their streamlined bodies and long wings allow them to fly swiftly and maneuver easily. These birds are often seen in large flocks, especially during migration. Many species, such as the barn swallow, build mud nests under eaves or bridges. Swallows are also known for their strong homing abilities, returning to the same nesting sites year after year.