One chimpanzee excavates with tool while another observes Parandis Majlesi (Center for Ecological and Evolutionary Synthesis, University of Oslo, Norway)
Chimps have spontaneously figured out how to use a stick to mash a potato. The finding could prompt a rethink of how tool use develops in primate societies.
Wild chimpanzees in Guinea climb palm trees to eat the trees鈥 鈥渉earts鈥, which look like white asparagus. They use sticks to mash the hearts before eating them, like cooks using pestles and mortars. Chimps elsewhere don鈥檛 do this, suggesting that the behaviour is cultural and that Guinea chimps pick it up by copying each other.
However, Claudio Tennie of聽the聽University of T眉bingen in聽Germany is sceptical about copying. Many studies have demonstrated…
