A shoal of fish


Swarming happens when animals gather or travel together in large numbers. Its most familiar examples are in insects, such as locusts and midges, flocking birds and shoaling fish. Some animals swarm as a defence against predation, others, such as locusts and bees, only form swarms in specific circumstances. Swarming can be carried out by the smallest and simplest micro-organisms, such as bacteria, and even by humans.

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