Collective motion is one of the most spectacular forms of collective behaviour. To better understand its main patterns, Prof. Tamás Vicsek and his team recorded tracks of pigeons, using miniature GPS-devices that were attached to the birds. It appeared that pigeons flying in a flock demonstrate a delicate collective decision making process. The team discovered a well-defined hierarchy among flock members, and the average spacial position of a pigeon within the flock strongly correlated with its place in this hierarchy.
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