Friendship is the single most important factor influencing our health, well-being, and
happiness. Creating and maintaining friendships is, however, extremely costly, in terms of …

Social complexity has been one of the recent emerging topics in the study of animal and
human societies, but the concept remains both poorly defined and understood. In this paper …

The rich diversity of morphology and behavior displayed across primate species provides an
informative context in which to study the impact of genomic diversity on fundamental …

Relative brain size has long been considered a reflection of cognitive capacities and has
played a fundamental role in develo** core theories in the life sciences. Yet, the notion …

Urbanisation exposes wildlife to new challenging conditions and environmental pressures.
Some mammalian species have adapted to these novel environments, but it remains …

The social intelligence hypothesis states that the demands of social life drive cognitive
evolution,,. This idea receives support from comparative studies that link variation in group …

Animal groups are often organized hierarchically, with dominant individuals gaining priority
access to resources and reproduction over subordinate individuals. Initial dominance …

What are the origins of intelligent behavior? The demands associated with living in complex
social groups have been the favored explanation for the evolution of primate cognition in …

Human brain size nearly quadrupled in the six million years since Homo last shared a
common ancestor with chimpanzees, but human brains are thought to have decreased in …

Neuroscience needs behavior. However, it is daunting to render the behavior of organisms
intelligible without suppressing most, if not all, references to life. When animals are treated …