A Rare Case
They could also be dangerous creatures, but this is caused by human error more often than not. Avoid them if you are not an expert. They are like cheetahs who will behave aggressively when scared.
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Bluff Charge
When gorillas are surprised or threatened, they will act violently in order to keep themselves safe. Silverback male gorillas will make bluff charges and roar loudly. They can run very fast too as well. Yikes.