One of the most important assumptions of kin selection theory is that individuals behave
differently towards kin than non‐kin. In mammals, there is strong evidence that maternal kin …

In the past several decades, the development of novel molecular techniques and the advent
of noninvasive DNA sampling, coupled with the ease and speed with which molecular …

At some point in the course of evolutionâe" from a primeval social organization of early
hominidsâe" all human societies, past and present, would emerge. In this account of the …

Although male parental care is rare among mammals, adult males of many cercopithecine
primate species provide care for infants and juveniles. This care is often in the form of …

Social bonds have been construed as mental representations mediating social interactions
among individuals. It is problematic, however, to differentiate this mechanism from others …

Abstract In 1963, Jeanne and Stuart Altmann traveled through Kenya and Tanzania
searching for a baboon study site. They settled on the Maasai-Amboseli Game Reserve …

Close associations between adult males and lactating females and their dependent infants
are not commonly described in non-monogamous mammals. However, such associations …

Patterns of primate socioecology have been used to suggest that the first truly savanna-
dwelling hominin, Homo ergaster, lived in sizeable groups. Here, we revisit these estimates …

Unlike most mammals, human fathers cooperate with mothers to care for young to an
extraordinary degree. Human paternal care likely evolved alongside our unique life history …

Promiscuous mating was traditionally thought to curtail paternal investment owing to the
potential costs of providing care to unrelated infants. However, mounting evidence suggests …