Animals have the ability to synchronize their behavior to that of their neighbors. This is noticeable when they sense danger.

When Japanese macaques detect danger, they make an alarm call, and allies in various locations react immediately and emit the same cry.

Vervet monkeys living in the African savanna use three types of alarm call for different enemies. The alarm call for eagles attacking from the sky prompts them to descend from the crown of the tree and hide between the branches. Conversely, the alarm call for a leopard prompts them to run up the tree, and the alarm call for a snake prompts them to stand up and look around. The monkeys take appropriate action corresponding to the type of call.

■References (Books, papers, Web articles, etc.)
The Thinking Ape: The Evolutionary Origins of Intelligence　　Richard Byrne　 Oxford University Press (March 23, 1995)
How Humans Evolved (Eighth Edition)　　Robert Boyd, Joan B. Silk　W. W. Norton & Company; Eighth edition (December 1, 2017)

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