The question as to why primates have evolved unusually large brains has received much
attention, with many alternative proposals all supported by evidence. We review the main …

The Norway rat has important impacts on our life. They are amongst the most used research
subjects, resulting in ground-breaking advances. At the same time, wild rats live in close …

Animals lead rich social lives. They care for one another, compete for resources, and mate.
Within a society, social relationships may be simple or complex and usually vary …

During the latter half of the last century, evidence of reproductive competition between males
and male selection by females led to the development of a stereotypical view of sex …

The social brain hypothesis was proposed as an explanation for the fact that primates have
unusually large brains for body size compared to all other vertebrates: Primates evolved …

We review evolutionary processes and mechanisms that gave rise to the diversity of primate
social systems. We define social organization, social structure and mating system as distinct …

We present a detailed reanalysis of the comparative brain data for primates, and develop a
model using path analysis that seeks to present the coevolution of primate brain (neocortex) …

Although both food availability and predation risk have been hypothesized to affect dolphin
habitat use and group size, no study has measured both factors concurrently to determine …

From the snub-nosed monkeys of China to the mountain gorillas of central Africa, our closest
nonhuman relatives are in critical danger worldwide. A recent report, for example, warns that …

This comprehensive introductory text integrates evolutionary, ecological, and demographic
perspectives with new results from field studies and contemporary noninvasive molecular …