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Powerful bite
Hippopotamus had a strong bite, which can even penetrate the metal of which are made smaller boats. Therefore, you are not sure even in the boat when Hippo attacks.
In a zoo is measured bite of even 2000 PSI, what is 6 times stronger than the shark, 5 times stronger than wolf bite, 3 times stronger than lion, twice stronger than Siberian and Bengal tiger and also twice stronger than polar and grizzly bear. Only saltwater and Nile crocodiles have a stronger bite (5000 PSI).