Research on the evolution of social behaviour has been dominated by genetic relatedness for a long time; however, both recent empirical studies and theoretical concepts give growing evidence for ecological factors acting as very prominent additional or alternative driving forces in social evolution. Now the time is ripe to investigate similarities and differences in the course of social evolution in different animals. This book brings together renowned researchers working on sociality in different animals. For the first time, they compile the evidence for the importance of ecological factors in the evolution of social life, ranging from invertebrate to vertebrate social systems, and evaluate its importance versus that of relatedness.

Communication and cognition.- Visual communication: evolution, ecology, and functional mechanisms.- Vocal communication in social groups.- Kin recognition: an overview of conceptual issues, mechanisms and evolutionary theory.- Honeybee cognition.- Individual performance in complex social systems: the greylag goose example.- Conflict and cooperation.- Conflict and conflict resolution in social insects.- Social insects, major evolutionary transitions and multilevel selection.- Cooperation between unrelated individuals - a game theoretic approach.- Group decision-making in animal societies.- Parental care: adjustments to conflict and cooperation.- Sex and reproduction.- The quantitative study of sexual and natural selection in the wild and in the laboratory.- Mate choice and reproductive conflict in simultaneous hermaphrodites.- Extra-pair behaviour.- Extreme polyandry in social Hymenoptera: evolutionary causes and consequences for colony organisation.- Monogynous mating strategies in spiders.- Mating systems, social behaviour and hormones.- Behavioural variation.- The social modulation of behavioural development.- Alternative reproductive tactics and life history phenotypes.- Animal personality and behavioural syndromes.- Social learning and culture in animals.- Levels and mechanisms of behavioural variability.

The time is ripe to investigate similarities and differences in the course of social evolution in different animals. This book brings together renowned researchers working on sociality in different animals to deal with the key questions of sociobiology. For the first time, they compile the evidence for the importance of ecological factors in the evolution of social life, ranging from invertebrate to vertebrate social systems, and evaluate its importance versus that of relatedness.