Sea otters in North America historically were distributed from the Near Islands in the western Aleutian Archipelago to about Punta Morro Hermoso on the Pacific coast of Baja California (Kenyon 1969, Rodriguez-Jaramillo and Gendron 1996). During the 18th and 19th centuries they were so common that they formed the basis for a lucrative fur trade (Ogden 1941), but by the early 1900s they were exploited to extinction in Baja California (Kenyon 1369).