Chimpanzees apparently possess metacognitive abilities - as the primates are capable of thinking about thinking.
Chimps have the same sense of fairness as human beings, say researchers who played the Ultimatum game with them - the first time the trait's been observed in a non-human species.
Chimpanzees engage in social traditions which they pass on to the next generation, new research shows.
Chimpanzees avoid telling their friends the bleedin' obvious, new research shows.
The US has significantly tightened its rules on the use of chimpanzees in medical research, ruling it out except for cases in which there's no other valid testing method.
It was a bit of a surprise for scientists to discover just how similar human and chimpanzee DNA is - and left them scratching their heads to explain the enormous physiological differences between the two species.
Chimps can tell the difference between different volumes of liquid, even when the bartender hides his actions.