A Swedish study found that chimps can plan, citing an attack by a chimp at a zoo:
According to a report in the journal Current Biology, the 31-year-old alpha male started building his weapons cache in the morning before the zoo opened, collecting rocks and knocking out disks from concrete boulders inside his enclosure. He waited until around midday before he unleashed a “hailstorm” of rocks against visitors, the study said.
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