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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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Luella and Winthrop Niles Kellogg believed they could use their own child in a chilling experiment involving a chimpanzee. Toddler Donald Kellogg was just 10 months old when he became one of the ...

The Maryland Zoo's chimpanzee troop is growing as Rozi gave birth to a baby girl.The chimpanzee born on June 10 was initially healthy, but then zookeepers noticed she wasn't getting enough of her ...

"We were pleasantly surprised by how strong and seemingly natural the chimpanzees' attraction to crystals was." ...

A recent study performed on chimpanzees demonstrates that chimpanzees possess cognitive flexibility similar to that of humans. When circumstances or evidence change, chimps appear to do the thing ...