Primate Behavior	Page 29
29) Primate body language can be very impressive. Here an adult male chimpanzee, on the left, stands with all his hair on end. This is called piloerection -- it makes an animal look larger to the nearby audience.

Notes: Three chimpanzees in a zoo enclosure. The adult male on the left facing the camera is getting ready to run by the animals on the right.
Question: How do humans try to change their appearance to impress other people?
Photo © by: Frans de Waal

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