Carel P. van Schaik

The paper shows orangutan mothers adjust their ranging behavior to increase offspring social play, at an energetic cost.

The paper finds that participation in between-group conflicts in wild vervet monkeys is linked to lower long-term cortisol levels, suggesting physiological benefits of cooperative behavior.

This study examines male services in vervet monkeys, finding that certain behaviors predict mating success, supporting reputation-based partner choice as a driver of cooperation.

This study analyzes testosterone dimorphism across mammals, finding no clear link to paternal care or sexual size dimorphism, but highlighting sampling matrix effects on testosterone ratios.

The study examines grooming exchanges between male-female vervet monkeys, finding that females initially invest heavily and reduce grooming over time, while males increase frequency after residency, leading to near reciprocity.

This study examines male vervet monkey leadership in high-risk terrain, finding that dominant males lead more often, especially in risky contexts, suggesting cooperative service rather than paternal care.

The paper analyzes social and individual learning in wild orangutans over eight years, finding that social learning is more frequent and synergistically shapes diet profiles with individual learning.

This study shows wild orangutans learn nest-building skills through observational social learning, with selective attention to 'know-how' and transmission of 'know-what' information.

This study shows that morphological traits, not socio-cognitive demands, are key predictors of brain size evolution in birds.

This study examines the relationship between brain size and short-term memory in primates, finding that overall brain size better predicts performance than specific brain regions or encephalization quotient.