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Hippopotamus - Wikipedia
Hippopotamus, facts and photos - National Geographic
Hippopotamus | Diet & Facts | Britannica
15 Hippopotamus Facts - Fact Animal
Hippopotamus - National Geographic Kids
Hippopotamus | Species | WWF - World Wildlife Fund
Characteristics and behavior of the hippopotamus | Britannica
Hippopotamus - Simple English Wikipedia, the free encyclopedia
Hippopotamus | African Wildlife Foundation
Hippopotamus - New World Encyclopedia