Steller's sea cow
Animal
Steller's sea cow is an extinct sirenian described by Georg Wilhelm Steller in 1741. At that time, it was found only around the Commander Islands in the Bering Sea between Alaska and Russia; its range ... Wikipedia
Extinction status: Extinct
Scientific name: Hydrodamalis gigas
Mass: 8,800 lbs (Adult)
Extinction date: 1768
Class: Mammalia
Domain: Eukaryota
Family: Dugongidae
Source: Encyclopedia of Life