It is no secret that robotic animals have been used in the past to study wolves and other wildlife species. For this video, a robot was used to show how Langur monkeys grieve a dead baby. They mistook a motionless robotic Spy Langur Monkey for a dead baby and started grieving:
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Langur Monkeys Grieve Over Robot Monkey
John Downer directed this series. You can find out more here.
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