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"The use of the stick as a weapon in this context was a unique action," study author and primatologist Jan van Hooff 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
Researchers say chimp planned attack on a passing drone
Primatologists say the chimps' faces showed exertion, not fear, so their drone-hunting was cold-blooded not panicked. They had a plan. And they executed it.
"The use of the stick as a weapon in this context was a unique action," study author and primatologist Jan van Hooff 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."