Data from: Benefits of coloniality: communal defence saves anti-predator effort in cooperative breeders

Arne Jungwirth, Dario Josi, Jonas Walker & Michael Taborsky
1. Many anti-predator benefits of group living are predicted to scale with prey density. Nevertheless, evidence for a general density-dependent increase of prey survival is scarce. A possible reason for this discrepancy is the reduction of costly anti-predator behaviour of prey with increasing density, which may offset density-dependent survival gains. Benefits of group living might hence accrue by saved investment into anti-predator behaviours rather than by increased survival rates. 2. Here, we experimentally presented predators...
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