Sites:
| Hippopotamus (Hippopotamus amphibius): Includes facts, photos and videos of the hippopotamus. | | Hippopotamus (Hippopotamus amphibius): Range, habitat, physical description, reproduction, behavior, and diet. | | Hippopotamus (Hippopotamus amphibius): Physical characteristics, habitat, diet, reproduction, and conservation status. | | World Conservation Union (IUCN) Hippo Specialists Group: Promotes scientifically-based action for the conservation of common and pygmy hippos. Includes conservation news, research, facts, and statistics. |
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