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Hippopotamus - Wikipedia
Size, Diet, Habitat, Evolution, & Images - Britannica
Hippopotamus - African Wildlife Foundation
15 Hippopotamus Facts - Fact Animal
Hippopotamus, facts and photos - National Geographic
Hippopotamus | Species | WWF - World Wildlife Fund
Hippopotamus: Habitat, Behavior and Diet - ThoughtCo
Hippopotamus - National Geographic Kids
Characteristics and behavior of the hippopotamus | Britannica
Common Hippo - Facts, Diet, Habitat & Pictures on Animalia.bio