Steller's sea cow (Hydrodamalis gigas) is an extinct sirenian discovered by Europeans in 1741. At that time, it was found only around the Commander Islands in the Bering Sea between Alaska and Russia; its range was more extensive during the Pleistocene epoch, and it is possible that the animal and humans previously interacted. Eighteenth century adults would reach weights of 8–10 metric tons (8.8–11.0 short tons) and lengths up to 9 meters (30 ft).