Grab a tissue.
The BBC show called "Spy In The Wild" put a realistic robot baby monkey into a Langur monkey community. Once the monkeys notice the robot baby monkey, they start to approach & play with it and care for it. But then one monkey accidentally dropped the robot baby monkey, and "killed" it.
The monkeys react instantly. They check to see if the robot baby monkey is still alive and then grief overcomes the community.
The hidden cameras were able to capture the intimate details of how monkeys mourn which looks very similar to us.