Question

why do animals form swarms?.

Answer 1

Its not just birds- mammals, reptilias, amphibians, fish, insects and even bacteria all do it. virtually every corner of the animal kingdom has found that banding together is a great tactic for surviving in the wild. A large swarm of randomly swirling krill make it much harder for fish to pick any single target

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Answer 2

When many individual organisms come together and move as one entity, that’s a swarm. From a handful of birds to billions of insects, swarms can be almost any size. They have no leader, and members interact only with their neighbors or through indirect cues. Members follow simple rules: travel in the same direction as those around you, stay close and avoid collisions.