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Only 10 Midges Needed to Make a Swarm

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Midge swarm

Midge swarms, such as this huge one photographed in South Africa, display 'emergent' behaviour in which they appear to have a common mind. But this can occur even with small numbers of insects.

Credit: Peter Johnson/Corbis

To most people, a cloud of midges is an annoyance.

From Nature
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