Chimp Planned Rock Attacks on Zoo Visitors

Researchers say a chimpanzee at a Swedish zoo has proven that apes are as capable of forward planning as humans. Zoo minders have uncovered hundreds of stone caches being used by the chimp to hoard ammunition to hurl at visitors. The chimp at the centre of this study, an alpha male in his 30s called Santino, lives at Furuvik Zoo to the north of Stockholm