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The selective benefits of living in groups may increase with group size but this will depend on predator species or hunting mode. We tested whether the strength of selection for flock size in redshanks, Tringa totanus, depended on hunting mode used by sparrowhawks, Accipiter nisus, and peregrine falcons, Falco peregrinus. Sparrowhawks prefer to ambush prey from cover, whereas peregrines normally attack...
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