Based on these observations and interviews with the zookeepers, Osvath thinks that [the chimp] Santino’s aggression was clearly premeditated. He was always visibly agitated when he threw his stones, as indicated by his two-legged loping walk and his hair standing on end. In contrast, he was always calm during the “planning stage” when he actually gathered stones - he wasn’t just doing it in response to any immediate desire. The two behaviours were also separated by several hours and Santino only ever gathered ammo before the zoo opened to visitors, so no human could have provoked his ire. The stones were very clearly an anti-human weapon. Santino never used either stones or concrete slabs for any other purpose other than to pelt tourists. He never chucked them during the six off-season months when the zoo is closed to the public. And he only ever placed them on the shoreline facing the visitors’ area, a sector comprising less than a quarter of the island’s full circumference.
Chimpanzee collects ammo for “premeditated” tourist-stoning
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