Chimp culture

Chimpanzees are copycats and, in the process, they form new traditions that are often specific to just one group. Such are the findings of an international group of scientists, who waded through over 700 hours of video footage to understand how it came about that one chimpanzee stuck a piece of grass in her ear and started a new trend. Unfortunately, Julie, the inventor of the trend, died. It continued without her.