sciencehabit writes "Three years ago, a stone-throwing chimpanzee named Santino jolted the research community by providing some of the strongest evidence yet that non-humans could plan ahead. Santino, a resident of the Furuvik Zoo in Gävle, Sweden, calmly gathered stones in the mornings and put them into neat piles, apparently saving them to hurl at visitors when the zoo opened as part of angry and aggressive 'dominance displays.' But some researchers were skeptical that Santino really was planning for a future emotional outburst. Now Santino is back in the scientific literature, the subject of new claims that he has begun to conceal the stones so he can get a closer aim at his targets—further evidence that he is thinking ahead like humans do."
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