Otter Specialist Group - IUCN
- The World Conservation Union (IUCN) Otter Specialist Group represents a worldwide group of experts helping to conserve all species of otters.
- http://www.otterspecialistgroup.org/

Otter Site
- Photographs of otters, otter surveying, wildlife watching, otter surveys and photographing opportunities in Cumbria.
- http://www.ottersite.btinternet.co.uk

Otter Special Group (Asian Section)
- Otter news, literature, and links.
- http://otter.nus.edu.sg/

WildCam Otters
- Indoor and outdoor views of otters in action, from National Geographic.
- http://www.nationalgeographic.com/ottercam/

Cape Clawless Otter - theBigZoo.com
- Aonyx capensis facts, photos and video of otter swimming. Also has message board.
- http://www.thebigzoo.com/Animals/Cape_Clawless_Otter.asp

Otternet
- Species, habitats, conservation news, links to other sites, kids' area, and contests.
- http://www.otternet.com/

River Otter Alliance
- Promotes the conservation of the North American River Otter (Lutra canadensis).
- http://www.otternet.com/ROA/

International Otter Survival Fund
- About otters and their conservation and protection worldwide.
- http://www.otter.org/