Swallows and martins comprise of two subfamilies: Pseudochelidoninae (the river martins of the genus Pseudochelidon) and Hirundininae (all other swallows and martins). Swallows and martins are mostly small, elegant, aerial species with long, tapered wings, forked tails (often with elongated outer feathers) and small bills but wide mouths, for catching insects in flight.
See also: Barn swallow, house martin, mangrove swallow, sand martin
