
Sea Cow skull. Museum quality replica. Steller's sea cow (Hydrodamalis gigas) is an extinct, large sirenian mammal formerly found near the Asiatic coast of the Bering Sea.
The sea cow grew up to 7.9 meters (25.9 ft) long[1] and weighed up to three tons,[2] much larger than the manatee or dugong. Steller's work contains two contradictory weights: 4 and 24.3 tons.