Cetotherium (name meaning "Whale Beast") is a genus of baleen whales that lived during the Late Miocene to Late Pliocene in what is now South America.
In the Series 3 episode "Into the Mega Jaws of Death," a pod of Cetotherium were brought to the park from Late Miocene Peru, 15 million years ago. They reside in the Whale Watching Enclosure.