Zoo chimp 'planned' stone attacks

A male chimpanzee in a Swedish zoo planned hundreds of stone-throwing attacks on zoo visitors, according to researchers.

Keepers at Furuvik Zoo found that the chimp collected and stored stones that he would later use as missiles.

Further, the chimp learned to recognise how and when parts of his concrete enclosure could be pulled apart to fashion further projectiles.


Photo from here.

Crucial to the current study is the fact that Santino, a chimpanzee at the zoo in the city north of Stockholm, collected the stones in a calm state, prior to the zoo opening in the morning.

The launching of the stones occurred hours later - during dominance displays to zoo visitors - with Santino in an "agitated" state.

This suggests that Santino was anticipating a future mental state - an ability that has been difficult to definitively prove in animals, according to Mathias Osvath, a cognitive scientist from Lund University in Sweden and author of the new research.

Full story here with audio link.