A large number or mass of small animals or insects, especially when in motion.

a group of many insects; "a swarm of insects obscured the light"; "a cloud of butterflies"

a gathering of animals (usually insects ) in one location

( Entom.). The simultaneous emergence or assemblings in one place of large numbers of an insect species. ( BCFT.).

The term swarm (schooling, swarming or flocking) is applied to fish, insects and birds and describes a behavior of an aggregation () of animals of similar size and body orientation, generally cruising in the same direction.