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Hippopotamus - Wikipedia
Hippo Fact Sheet | Blog | Nature - PBS
Hippopotamus, facts and photos - National Geographic
River hippo - San Diego Zoo Wildlife Explorers
Hippopotamus | Size, Diet, Habitat, Evolution, & Images | Britannica
Hippopotamus | Species | WWF - World Wildlife Fund
River Hippopotamus - Denver Zoo
Hippos: Africa's River Giants | About | Nature - PBS
Hippopotamus - National Geographic Kids
10 Hippopotamus Facts About The River Horses - TRVST