A large number of bird species live in stable groups, and this sets
the scene for complex social behaviours, such as co-operative
breeding. The vast majority of groups consist of families which
arise when young postpone dispersal and remain with their parents
beyond independence. However, the factors selecting for the
evolution of families and thus also co-operative breeding among
birds, are still a challenging puzzle. The currently accepted key
explanation for the evolution of families and co-operative breeding
focuses on dispersal constraints. While constraints successfully
explain within-population dispersal decisions, they fail as an
ultimate explanation because offspring in the majority of species
face some sort of dispersal constraint, yet still disperse
promptly. Recent alternative explanations focus on the role of
philopatry and nepotism, and emphasise a key role of life-history
for the evolution of families. In this book the authors first
review where prolonged family associations are found, and then
present a typology of family living to show the diversity of
territorial systems and social systems in which families are found.
General
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