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