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Hippopotamus - Wikipedia
Hippopotamus, facts and photos - National Geographic
Hippopotamus | Diet & Facts | Britannica
Hippopotamus: Habitat, Behavior and Diet - ThoughtCo
Hippo Fact Sheet | Blog | Nature | PBS
Hippopotamus | Species | WWF - World Wildlife Fund
Hippopotamus | African Wildlife Foundation
Hippopotamus - National Geographic Kids
Hippo | San Diego Zoo Animals & Plants
Characteristics and behavior of the hippopotamus | Britannica