- African Wildlife Foundation: Hippopotamus
- Describes appearance, size, locations, gestation, predators, social system, parenting, feeding habits, threats, and source of name.
- Animal Bytes: Hippopotamus
- Article from San Diego Zoo looks at range and habitat, photographs, life cycle, fun facts, name derivation, adaptations, skin, sense, diet, herds, and status.
- Animal Bytes: Hippopotamus
- Explores classification, description, diet, life cycle, distribution, behavior, and impact on the ecosystem. From SeaWorld.org.
- Canadian Museum of Nature: Hippopotamus
- Natural History Notebook furnishes images, range map, distribution, size, characteristics, behavior, and feeding habits.
- Hippopotamus (Hippopotamus amphibius)
- National Geographic reports basic facts, activity, young, distribution, and population decline. Provides range map, sound clip, and printable factsheet.
- Hippopotamus (Hippopotamus amphibius)
- Animal Diversity offers other name, locations, preferred biome, coloration and size, mating, parenting, activity, groups, diet, and status.
- Hippopotamus (Hippopotamus amphibius)
- TheBIGZoo page contains links to videos and sound clip, physical characteristics, diet, regions, predators, social behavior, offspring, and senses.
- National Zoo: Nile Hippopotamus
- Examines shape, movement, size, geographic distribution, population status, habitat, natural and zoo diets, breeding, history, and fun facts.
- River Hippopotamus (Hippopotamus amphibius)
- Ultimate Ungulate discusses measurements, coloring, life cycle, activity, diet, family group, distribution, and status. Offers photographs and range map.
- WhoZoo.org: Hippopotamus
- Provides general information, physical description, adaptations, vocalizations, behavior in the wild, and observations at the zoo.
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