Further experiments conducted beginning in the 1940s showed that chimps lacked the necessary anatomical structures to speak English—though one chimp, named Viki, was ultimately able to say mama, papa, ...

Chimpanzees appear to execute Rational Evidence-Weighing in complex decision-making tasks. The experiments conducted demonstrated that chimps changed their minds when presented with stronger evidence.

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A celebration for chimpanzee Shobo. The research team celebrated the success of his treatment for hepatitis C with a feast that included mangoes and other fruits and vegetables. Kyoto, Japan -- As ...

As close relatives of humans, chimpanzees have sometimes been used in biomedical experiments. They were instrumental in the identification of the hepatitis C virus: The then-mysterious pathogen was ...