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Putty-nosed monkeys live in rain forests in Africa. They make noises to communicate with each other. For example, they make the sound pyow when danger is, near, and the sound hack when danger is coming from the air.

Scientists are studying the communication among putty-nosed monkeys. They believe the monkeys can put sounds together into "sentences, which make new meanings. One "sentence" is pyow pyow hack hack hack hack, which means “Let's go somewhere else.”

This is a very exciting development in the study of animal communication. Scientists believe this means that some animals are more intelligent than we first thought.