Sea Otters (Enhydra lutris) are marine mammals and members of the weasel family. They are the only marine mammal to rely on their fur instead of fat for warmth. Their fur is the thickest of any mammal and the primary reason for their decline in numbers. Starting in the the mid 1700’s to the early part of the 20th century, Sea Otters were hunted for their fur leading them to the brink of extinction.
For more on Sea Otters go to:
http://animals.nationalgeographic.com/animals/mammals/sea-otter/
For info on Sea Otter conservation go to: http://www.aquariumofpacific.org/exhibits/northern_pacific_gallery/otters/sea_otter_conservation