For the past 20 years, J. R. Krebs and N. B. Davies have been synonymous with introductory books on behavioural ecology. In their fourth edition of Behavioural Ecology: An Evolutionary Approach, they incorporate similar topics from previous editions with new chapters on the exciting developing fields of cognitive ecology, phylogenetics, population genetics and conservation. Most noticeable, however, is the new hierarchical organization of the book. The book is divided into three major parts: ‘Mechanisms and individual behaviour', ‘From individual behaviour to social systems', and ‘Life histories, phylogenies and populations'.
