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.