Head: Like all ceratopsians

allowing them to survive in cold waters

The Tylosaurus had four well-developed flippers that acted as paddles for swimming in the sea

On a distant shoreline

Dorudon atrox Paleozoico superior Head: Like all ceratopsiansDorudon atrox is an extinct species of cetacean mammal that belongs to the Basilosauridae group. Cetaceans are a group of marine mammals that includes whales, dolphins, and porpoises. The Basilosauridae are a family of archaic cetaceans that lived during the Eocene, approximately 40 to 35 million years ago. The name "Dorudon" comes from the Greek term "dory" which means spear, and "odon" which means tooth, referring to the sharp teeth it possessed.