Livyatan was a species of whale that lived approximately 12 to 13 million years ago. It was roughly the same size as a modern day sperm whale, but had functional teeth in its upper jaw as well as its lower.
Livyatan shared its habitat with the giant shark Megalodon, and the two were likely top predators of their time.
The name Livyatan comes from the Hebrew spelling of "Leviathan", which is a large monster mentioned in the Bible. Livyatan was originally given the name Leviathan until it was discovered that the name had already been assigned to a species of Mastodon.
Livyatan appears in the game Jurassic Park: Builder as an adoptable animal in Aquatic Park. However, it actually appears under its original name of "Leviathan".