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Flocks of starlings ride the wave to escape: Researchers study agitation waves that form when flocks of birds dodge predators


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Why does it seem as if a dark band ripples through a flock of European starlings that are steering clear of a falcon or a hawk? It all lies in the birds' ability to quickly and repeatedly dip to one side to avoid being attacked. For a split second, these zigs change the view that observers on the ground have of the birds' wings to cause a so-called agitation wave. This evasive strategy is copied as quick as a flash from one neighboring bird to the next.ehMNb1TRHQ8

 

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