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Why do gorillas beat their chests?

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Gorillas beat their chests after a fight and that they have won. Also they use it as a warning signal for the young gorillas to move away.
User Guy Schalnat
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They do this as a warning signal for younger gorillas to back off else they will be engaged in a fight. They also beat their chests after a fight to as a sign of their victory and dominance.
User Deryck
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