- Amblonyx Otter Site
 - Includes a detailed factfile on British otters. - Cute Otters
- Showcasing cute images and videos of otters submitted by users.
- Discover Learning Web Journey: Sea Otters
- Learn about their population, their ecosystems, behaviour, and the differences between river and sea otters.
- Enhydra lutris (Sea Otter)
- Animal Diversity Web profile of the sea otter. Features habitat, lifespan, behaviour, and conservation status.
- Kids' Planet: Sea Otter
- Includes information on the sea otter. Offers up stats on an otter's size, population, lifespan, and behaviour.
- Monterey Bay Aquarium: Sea Otters
- Looks at their lives in captivity and in the wild. Includes sea otter antics, resident otter introductions, and photos.
- NATURE: Yellowstone Otters
- Looks at the entertaining behaviour of the river otter, Lutra canadensis.
- Otternet
- Reference site with the 13 otter species, habitat, links, and pictures.
- River Otter (Lutra canadensis)
- Information on the river otter including description, habitat, and feeding.
- Sea Otters, California's Threatened Treasure
- Touches upon their habitat, diet, appearance, life at sea, reproduction, and other aspects of their natural history.
- Wikipedia: Northern River Otter
- Information on the river otter includes diet and history, personality, description, and habitat.
- Wikipedia: Sea Otter
- User-created article describing sea otters (enhydra lutris). Features description, breeding, threats to otter populations, and references.
- WildCam: Otters
- Live indoor and outdoor views of two river otters living at the home of Glenn and Jeannie Chambers.
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