VIDEO: Orangutans lie about their size?

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You are orangutans to their size?

19 March 2015 Last updated at 10:36 GMT

Orangutans use their hands to change your voice and see him more, scientists say.

Animals cup to his mouth in the manufacture of grinding KISS - alarm calls often mean that a predator is near.

Now researchers have the acoustics of the "kiss squeak changed by the hand" investigated and shown that animals seem bigger and "most impressive" when they use their hands in the call.

In this video, filmed by Wendy Erb Rutgers University in New Jersey, you can see how a call orangutan kiss cry, followed by another hand. If you listen carefully you can hear the difference between the two calls.

Courtesy of Dr. Wendy Erb

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