Chimp's stone throwing at zoo visitors was 'premeditated'
Wednesday, March 11, 2009 - 13:29
in Biology & Nature
Researchers have found what they say is some of the first unambiguous evidence that an animal other than humans can make spontaneous plans for future events. The report in the March 9th issue of Current Biology, a Cell Press publication, highlights a decade of observations in a zoo of a male chimpanzee calmly collecting stones and fashioning concrete discs that he would later use to hurl at zoo visitors.