Female degus (Octodon degus) monitor their environment while foraging socially

The genetical evolution of social behaviour. I

W D Hamilton · Journal of Theoretical Biology · 1964 · 15.9K citations

Life Sciences, Evolutionary Biology, Genetics +14

On the advantages of flocking

H. Ronald Pulliam · Journal of Theoretical Biology · 1973 · 1.3K citations

Agriculture, Poultry Science, Collective Behavior +6

Why individual vigilance declines as group size increases

Gilbert Roberts · Animal Behaviour · 1996 · 912 citations

Management, Behavioral Sciences, Psychology +11

Cooperation among animals: an evolutionary perspective

Choice Reviews Online · 1997 · 716 citations

Life Sciences, Biology, Evolutionary Biology +17

Back to the basics of anti-predatory vigilance: the group-size effect

Steven L. Lima · Animal Behaviour · 1995 · 701 citations

Life Sciences, Ecology, Psychology +14