Primate Behavior and Ecology

A cross-center comparison of the relationship between matriline fragmentation, grooming cohesion, and agonistic behavior in captive rhesus macaque (Macaca mulatta) social groups

Across 105 rhesus macaque matrilines at two primate centers, family grooming cohesion drops below a mean kinship threshold of 0.16, while lower kinship continuously increases severe within-family aggression.

Sumatran orangutan mothers differ in the extent and trajectory of their expression of maternal behaviour

After controlling for confounders, 15 wild Sumatran orangutan mothers differed consistently in average expression of four of six maternal behaviours and in age-related plasticity for three.