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

Cooperative breeding in mammals, birds and fish has provided evolutionary biologists with
a rich framework for studying the causes and consequences of group-based reproduction …

Some individuals (helpers) in cooperatively breeding species provide alloparental care and
often suppress their own reproduction. Kin selection is clearly an important explanation for …

Several hypotheses aim to explain the evolution of hel** behavior, but conclusive
experimental support for evaluating the relative importance of individual hypotheses is still …

Neolamprologus pulcher, a cooperatively breeding cichlid fish from Lake Tanganyika, lives
in permanent social groups comprising one breeding pair and helpers of both sexes …

Functional interpretations of hel** behaviour suggest that it has evolved because helpers
increase their direct or indirect fitness by hel**. However, recent critiques have suggested …

Inclusive fitness benefits have been suggested to be a major selective force behind the
evolution of cooperative breeding. We investigated the fitness benefits selecting for …

Little attention has been paid to a conspicuous and universal feature of animal societies: the
variation between individuals in hel** effort. Here, we develop a multiplayer kin–selection …

Evolution's Arrow argues that evolution is directional and progressive, and that this has
major consequences for humanity. Without resort to teleology, the book demonstrates that …

We study the spatial adaptive dynamics of a continuous trait that measures individual
investment in altruism. Our study is based on an ecological model of a spatially …