North American river otters occur throughout Canada and the United States, except for areas of southern California, New Mexico, and Texas, and the Mohave desert of Nevada and Colorado. In Mexico they are found in the delta areas of the Rio Grande and Colorado river. Otters were locally extirpated from portions of their range but reintroduction and conservation efforts have helped stabilize populations.
Biogeographic Regions: nearctic (Native )
- NatureServe, 2008. "NatureServe Explorer: An online encyclopedia of life version 7.0" (On-line). Accessed January 23, 2009 at http://www.natureserve.org/explorer.