What causes the vervet monkey to perform the leopard alarm call?

Answer

The presence of a ground predator

The leopard call is a specific vocalization used when a ground predator is identified. Upon hearing this cough or bark, the monkeys understand they need to move to a higher vantage point. They climb into the thinner branches of trees where heavy ground predators, such as leopards, cannot easily follow them.

What causes the vervet monkey to perform the leopard alarm call?

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