Stone-throwing chimpanzee displays human-like planning abilities

A chimp in a Swedish zoo plans his day around the chance to throw rocks at pesky human visitors. A researcher sees 'advanced consciousness and cognition traditionally not associated with animals.' Santino knew the humans were coming. So each morning, he trolled for stones and fashioned concrete disks to be stashed in strategic locations until it was time to hurl them at his pesky visitors.

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