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15 Hippopotamus Facts - Fact Animal
10 Hippo Facts! - National Geographic Kids
37 Interesting Facts About Hippos that You Didn’t know
Hippopotamus, facts and photos - National Geographic
Hippopotamus - Wikipedia
24 Fun and Interesting Hippopotamus Facts - FactRetriever
Hippopotamus | Diet & Facts | Britannica
Hippopotamus | Species | WWF - World Wildlife Fund
Hippopotamus - National Geographic Kids
12 Fun Hippo Facts - Treehugger