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26 of this week's best animal photos

hippopotamus
A hippopotamus also known as the common hippo swims in its enclosure at the San Diego Zoo, California on January 13, 2015. The name hippopotamus comes from the ancient Greek for "river horse". Hippos can be very aggressive towards humans. AFP PHOTO/MARK RALSTONMARK RALSTON/AFP/Getty ImagesAFP - Getty Images