Hydrodamalis Gigas is a scientific name assigned to a marine animal commonly known as Steller's Sea Cow. The name was given after the Russian naturalist Georg Wilhelm Steller who first discovered the animal during his 1741 exploration of the Bering Island coastline. Hydrodamalis Gigas was a massive herbivorous mammal that lived in the North Pacific before it went extinct within three decades of its discovery. Synonyms for the name vary depending on the region. In North America, it is also called Steller's Manatee, while in Japan, it is known as Koryu or Sea Elephant. In Russia, it is referred to as the Commander Island Sea Cow.