A rarely seen mammal thought by many to be absent at Lake Tahoe is being spotted again.

River otters had been known to exist for many decades in the Tahoe basin, but at one point they were only known to exist at Marlette Lake above Tahoe's east shore.

A pair of the animals have been observed swimming, splashing and sliding in a lagoon near their home in the Tahoe Keys subdivision in South Lake Tahoe over the last couple of years.