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Roberts, Gilbert - School of Biology and Psychology, University of Newcastle upon Tyne
Behavioural Processes 63 (2003) 127128 The group-size effect in non-feeding animals
Anim. Behav., 1996, 51, 10771086 Why individual vigilance declines as group size increases
Competitive altruism: from reciprocity to the handicap principle
Prey scan at random to evade observant predators Jack Scannell1
