Primate Behavior	Page 59
59) The chimpanzee can be very aggressive. However, as with all primates, most aggression does not lead to serious consequences. Here a male shakes a branch as part of a display. If his opponent does not back down, a fight may occur.

Notes: A piloerected adult male chimpanzee shakes a branch while another animal watches.
While many conflicts between chimpanzees involve only noisy displays, chimpanzees are the one primate besides humans known to kill adult animals of the same species during a fight.
Photo © by: Frans de Waal

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