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Adolescent and young adult male chimpanzees form affiliative, yet aggressive relationships with females

Journal Article

Primates frequently form affiliative relationships that have important fitness consequences. Affiliative relationships between unrelated males and females are ubiquitous in humans but are not widely reported in humans' closest living relatives...

Caregiving relationships as evolutionary and developmental bases of obligation. Commentary on target article: M. Tomasello, 'Moral psychology of obligation.'

Journal Article

Obligation as defined by Tomasello requires mutually capable parties, but one-sided caregiver relationships reveal its developmental and evolutionary precursors. Specifically, “coercive” emotions may prompt protective action by caregivers toward infant...

Social relationships and caregiving behavior between recently orphaned chimpanzee siblings

Journal Article

When their mothers die, chimpanzees often adopt younger vulnerable siblings who survive with their care. This phenomenon has been widely reported, but few studies provide details regarding how sibling relationships change immediately following the deaths...

Simultaneous outbreaks of respiratory disease in chimpanzees caused by distinct viruses of human origin

Journal Article

Respiratory viruses of human origin infect wild apes across Africa, sometimes lethally. Here we report simultaneous outbreaks of two distinct human respiratory viruses, human metapneumovirus (MPV; Pneumoviridae: Metapneumovirus) and human respirovirus 3...

Adolescent male chimpanzees do not form a dominance hierarchy with their peers

Journal Article

Dominance hierarchies are a prominent feature of the lives of many primate species. These hierarchies have important fitness consequences, as high rank is often positively correlated with reproduction. Although adult male chimpanzees strive for status to...

No evidence for yawn contagion in lemurs

Journal Article

Among some haplorhine primates, including humans, relaxed yawns spread contagiously. Such contagious yawning has been linked to social bonds and empathy in some species. However, no studies have investigated contagious yawning in strepsirhines. We...

Social inhibitory control in five lemur species

Journal Article

We tested five lemur species-ring-tailed lemurs, ruffed lemurs, mongoose lemurs, black lemurs, and Coquerel's sifakas-(N = 52) in an experiment that evaluated skills for inhibitory control in a social context. First, two human experimenters presented...

The evolution of self-control

Journal Article

Cognition presents evolutionary research with one of its greatest challenges. Cognitive evolution has been explained at the proximate level by shifts in absolute and relative brain volume and at the ultimate level by differences in social and dietary...

Group size predicts social but not nonsocial cognition

Journal Article

The social intelligence hypothesis suggests that living in large social networks was the primary selective pressure for the evolution of complex cognition in primates. This hypothesis is supported by comparative studies demonstrating a positive...

Sociosexual behaviour in wild chimpanzees occurs in variable contexts and is frequent between same-sex partners

Journal Article

Many animals engage in sociosexual behaviour, including that between same-sex pairs. Bonobos (Pan paniscus) are famous for their sociosexual behaviour, but chimpanzees (Pan troglodytes) apparently do not engage in sociosexual behaviour frequently. However...

Social relationships between chimpanzee sons and mothers endure but change during adolescence and adulthood.

Journal Article

Mothers provide indispensable care for infants in many mammalian species. In some long-lived species, the maternal-offspring bond persists after infancy with mothers continuing to provide resources and social support to their adult progeny. Maternal...

The development of affiliative and coercive reproductive tactics in male chimpanzees

Journal Article

Like many animals, adult male chimpanzees often compete for a limited number of mates. They fight other males as they strive for status that confers reproductive benefits and use aggression to coerce females to mate with them. Nevertheless, small-bodied...

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Adolescent and young adult male chimpanzees form affiliative, yet aggressive relationships with females

Caregiving relationships as evolutionary and developmental bases of obligation. Commentary on target article: M. Tomasello, 'Moral psychology of obligation.'

Social relationships and caregiving behavior between recently orphaned chimpanzee siblings

Simultaneous outbreaks of respiratory disease in chimpanzees caused by distinct viruses of human origin

Adolescent male chimpanzees do not form a dominance hierarchy with their peers

No evidence for yawn contagion in lemurs

Social inhibitory control in five lemur species

The evolution of self-control

Group size predicts social but not nonsocial cognition

Sociosexual behaviour in wild chimpanzees occurs in variable contexts and is frequent between same-sex partners

Social relationships between chimpanzee sons and mothers endure but change during adolescence and adulthood.

The development of affiliative and coercive reproductive tactics in male chimpanzees