What is flock swallows?

Flock swallows refers to a behavior exhibited by swallows, particularly during migration or feeding, where they gather in large groups or flocks. These birds, known for their agile flight and graceful aerial maneuvers, often form flocks to enhance foraging efficiency and provide safety in numbers against predators. This social behavior is commonly observed in species like the barn swallow and the cliff swallow, especially during the warmer months when they are more active.