If you’d swung by to see the chimps at Furuvik Zoo in Gävle, Sweden, back in 1997, there’s a good chance you might’ve received a rock to the head. It was around this time that a male chimpanzee called Santino had started exhibiting an impressive – albeit slightly problematic – behavior. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

You see, Santino had developed a taste for hurling rocks at visitors. Primates throwing things isn’t unusual, but Santino wasn’t just picking up anything during these episodes. Oh no, he had planned for it.

Zoo animals get used to seeing humans wandering around their enclosures. It’s the same reason why so many zoos tried to make up for the sudden dip in footfall during the COVID-19 lockdowns with chim

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