Approximate measurements of the Sivatherium:

and other states

face off in a barren and desolate setting

and low-lying shrubby vegetation

Dorudon atrox Paleozoico superior Approximate measurements of the Sivatherium:Dorudon 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.