▪ Abstract It has recently been argued that the paradox of helping behavior in birds has been
solved. This optimism may be premature. I argue that there is no obvious dichotomy …

An evolutionary framework for viewing the formation, the stability, the organizational
structure, and the social dynamics of biological families is developed. This framework is …

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 …

Social norms and the associated altruistic behaviours are decisive for the evolution of
human cooperation,,,,,,,, and the maintenance of social order, and they affect family life …

Why do the young of cooperative breeders-species in which more than two individuals help
raise offspring at a single nest-delay dispersal and live in groups? Answering this …

The ecological constraints hypothesis is widely accepted as an explanation for the evolution
of delayed dispersal in cooperatively breeding birds. Intraspecific studies offer the strongest …

In approximately 3.2% of bird species individuals regularly forgo the opportunity to breed
independently and instead breed cooperatively with other conspecifics, either as non …

Eusocial societies are traditionally characterized by a reproductive division of labor, an
overlap of generations, and cooperative care of the breeders' young. Eusociality was once …

The evolution of cooperation among animals has posed a major problem for evolutionary
biologists, and despite decades of research into avian cooperative breeding systems, many …

In cooperatively breeding superb fairy-wrens (Malurus cyaneus), all males contribute to the
feeding and defence of young. Despite the expectation that such paternal care should be …