One commonly cited benefit to animals that forage in groups is an increase in the probability
of detecting a predator, and a decrease in the time spent in predator detection. A …

A reduction in individual vigilance with an increase in group size is one of the most
frequently reported relationships in the study of animal behaviour. It has been argued that …

Many of our questions about religion, says the internationally renowned anthropologist
Pascal Boyer, were once mysteries, but they no longer are: we are beginning to know how to …

The author shares some lessons learned from a lifetime of working with and thinking about
groups. Three types of groups are described, including the impact they have on the …

Publisher Summary The chapter describes a simple economic model that predicts in a
qualitative way on how costs (lost feeding opportunity and risk) interact to produce an …

The amount of risk animals perceive in a given circumstance (ie their degree of 'fear') is a
difficult motivational state to study. While many studies have used flight initiation distance as …

What are the main selective forces that favoured the evolution of group living in non-human
primates? Three different answers have been sug-gested. ALEXANDER (1974) championed …

Previous experimental research has suggested that chimpanzees may understand some of
the epistemological aspects of visual perception, such as how the perceptual act of seeing …

This comprehensive introductory text integrates evolutionary, ecological, and demographic
perspectives with new results from field studies and contemporary noninvasive molecular …

It has long been thought that predation has had important ecological and evolutionary
effects on primates as prey. Predation has been theorized to have been a major selective …