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Swallows are a group of passerine birds known for their agile flight and graceful aerial acrobatics. They typically have streamlined bodies, pointed wings, and long, pointed bills, which they use to catch insects on the wing. Swallows are often recognized by their distinctive forked tail, which helps them maneuver quickly and efficiently through the air. These birds are found worldwide and are known for their migratory behavior, with many species traveling great distances between their breeding and wintering grounds. Swallows are also known for their sociable nature, often nesting in colonies and exhibiting strong pair bonds.