A chimp that deliberately fashions discs of concrete to later hurl at zoo visitors is being hailed as definitive proof that the apes plan for future events.
According to the NewScientist website Although similar claims have previously been made about chimps using tools to collect food.
But what sets Santino -- a 30-year-old chimp from Furuvik zoo in Sweden -- apart, is that his behavior, and therefore his apparent state of mind, when collecting the ammunition seems markedly different from when he launches his attacks.
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"The chimp has without exception been calm during gathering or manufacture of the ammunition, in contrast to the typically aroused state [when he throws the rocks]," says Mathias Osvath of the University of Lund, also in Sweden.