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Very good — you have already mastered half the basic vocabulary of the Campbell’s monkey, a fellow primate that lives in the forests of the Tai National Park in Ivory Coast.

The adult males have six types of call, each with a specific meaning

, but they can string two or more calls together into a message with a different meaning.

Having spent months recording the monkeys’ calls in response to both natural and artificial stimuli, a group led by Klaus Zuberbühler of the University of St. Andrews in Scotland argues that the Campbell’s monkeys have a primitive form of syntax.