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My thoughts on swarming:  I think one of the main benefits of swarming is that living things are much less likely to be eaten by a predator when they're with a group.  They would be much more likely eaten if they were alone or with one or two others.  Also, living things like to be around others that are similar.  Even humans sometimes form cliques and gangs to feel safer and like they are important to others.

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Swarming helps protect individuals from being attacked by predators.  This helps organisms survive so they can reproduce offspring that will also swarm.

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Flocking, Herding, and Schooling are all types of swarming.  Birds travel in a flock.  Fish travel in a school.  Many land animals such as buffalo travel in a herd.

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A herd of Buffalo

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A school of fish

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A swarm of bees

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Swarming is a behavior of animals that has them group together.

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A flock of birds

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A helpful behavior for animals