A zoo keeper feeds a Hippopotamuses (hippopotamus amphibius) at the Taipei Zoo in Taipei, Taiwan, July 12, 2014. Hippopotamus is an ancient Greek word for “river horse”. An average adult hippo's weight is 1.5 tons for male and 1.3 tons for female, making them the third-largest land mammal after elephant and rhinoceros. (Photo by David Chang/EPA)
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