Researchers analyzing footage of chimpanzees at Burgers’ Zoo in the Netherlands aggressively attacking a drone say the primates planned their actions in advance and weren’t acting out of fear. The group of chimps noticed the drone during a preliminary flyby and immediately grabbed twigs and long sticks before climbing to the treetops. When the drone returned, they were prepared. "The use of the stick as a weapon in this context was a unique action," study author Jan van Hooff, a primatologist with life-long ties to the zoo, said in a statement. "It seemed deliberate, given the decision to collect it and carry it to a place where the drone might be attacked." The primates have not been taught to use tools, but have learned 13 unique skills by observing humans visiting the zoo.
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