An article published in the journal “PLOS ONE” reports the observation of the spontaneous use of tools to dig food buried in the ground in the zoo by a group of chimpanzees on the island where there’s the Kristiansand Zoo, in Norway. A team of researchers led by Adriana Hernandez-Aguilar of the University of Oslo observed the kind of actions taken by chimpanzees that never had the chance to observe them.