Primate Behavior	Page 53
53) Unfriendly behavior usually begins with a threat. Here an adult gorilla shows the body posture and facial expression that lets an opponent know a fight is possible.

Notes: Adult female lowland gorilla (standing), living in a zoo group, stares at an opponent off-camera. A juvenile sits near her.
This is called a pursed lip threat posture. Look at the stiff arms and the tight position of the lips.
Photo © by: Nancy Staley

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