Washington [US]: The first evidence of lasting social relationships between chimpanzees and gorillas in the wild has been found during a long-term study led by primatologist Crickette Sanz at Washington University in St. Louis.
Drawn from more than 20 years of observations at Nouabale-Ndoki National Park in the Republic of Congo, researchers documented social ties between individual chimpanzees and gorillas that persisted over years and across different contexts.
