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  1. Hippopotamus - Wikipedia

  2. Hippopotamus | Size, Diet, Habitat, & Evolution | Britannica

  3. Hippopotamus, facts and photos - National Geographic

  4. Hippopotamus - Description, Habitat, Image, Diet, and ...

  5. Hippopotamus | Species | WWF - World Wildlife Fund

  6. Hippopotamus - Hippo Facts, Pictures & Information

  7. Hippopotamidae - Wikipedia