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In page Swarm robotics:

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The research of swarm robotics is to study the design of robots, their physical body and their controlling behaviours. It is inspired but not limited by[1] the emergent behaviour observed in social insects, called swarm intelligence. Relatively simple individual rules can produce a large set of complex swarm behaviours. A key-component is the communication between the members of the group that build a system of constant feedback. The swarm behaviour involves constant change of individuals in cooperation with others, as well as the behaviour of the whole group.