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Hippopotamus - Wikipedia
Hippopotamus, facts and photos - National Geographic
15 Hippopotamus Facts - Fact Animal
Hippopotamus | Diet & Facts | Britannica - Encyclopedia Britannica
57 Huge Hippo Facts: Complete Guide to the Massive Hippopotamus
Biggest Hippo Ever Recorded - American Oceans
Hippo Fact Sheet | Blog | Nature - PBS
Hippopotamus - National Geographic Kids
Hippopotamus | Species | WWF - World Wildlife Fund
Facts about hippos - Live Science