Hydrodamalis Gigas

Steller's sea cow (Hydrodamalis gigas) was a large, herbivorous marine mammal. It was the largest member of the order Sirenia, which includes its closest living relative, the dugong, and the manatees. Although the sea cow had formerly been abundant throughout the North Pacific, by 1741, when it was first described by Georg Wilhelm Steller, chief naturalist on an expedition led by explorer Vitus Bering,[3] its range had been limited to a single, isolated population surrounding the uninhabited Commander Islands. Within 27 years of discovery by Europeans, the slow-moving and easily-captured Steller's sea cow was hunted to extinction.