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The formation of waves is a vivid example of collective behaviour occurring in insects, birds, fish and mammals, which has been interpreted as an antipredator response. In birds a quantitative characterization of this phenomenon, involving thousands of individuals, is missing and its link with predation remains elusive. We studied waves in flocks of starlings, a highly gregarious species, by both...
To test the hypothesis that variation in aerial flocking behaviour is adaptively related to predation risk, we described and quantified the flocking patterns of starlings, approaching two urban roosts, which differed in predation pressure (by peregrine falcons, Falco peregrinus). We predicted that the higher predation pressure in one of the roosts would be reflected in larger and more compact flocks,...
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