▪ 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 …

Fish exhibit an enormous variety of reproductive patterns. There is external and internal
fertilization, simultaneous and sequential hermaphroditism as well as gonochorism, and an …

In The Black-Tailed Prairie Dog, John L. Hoogland draws on sixteen years of research at
Wind Cave National Park, South Dakota, in the United States to provide this account of …

At first sight just a small brown bird, the dunnock's unobtrusive appearance belies its
extraordinary behaviour and mating patterns. In this book Nick Davies gives a full account of …

Chimpanzees are among the few mammals that engage in lethal coalitionary aggression
between groups. Most attacks on neighbors occur when parties made up mostly of adult …

Kin discrimination, the differential treatment of conspecifics based on kinship, occurs across
the tree of life, from animals to plants to fungi to bacteria. When kin and nonkin interact, the …

When it comes to subsistence, men and women in almost all societies do it differently. One
long‐standing explanation for this sexual division of labor is that men and women pair up to …

EXTRA-PAIR copulations, in which a female copulates with a male other than her mate, are
known to occur in many bird species1. Here we study a wild population of reed buntings …

Recognition of conspecifics is necessary for differential treatment of individuals in a variety
of social contexts, such as territory establishment and defense, dominance hierarchies …

An individual's optimal investment in young depends partly on the number of individuals
caring for the same brood. In cooperative breeders, the investment strategy of parents with …