Estemmenosuchus was a therapsid that lived in the Permian period. It was thought to be an omnivore and was quite large, reaching 7 – 10 feet in length. It had many bony protrusions on its skull that it likely used in combat. It is thought to have been semi aquatic in nature.
Estemmenosuchus is highly territorial and is commonly found in swamp and other large bodies of water in small packs. It can catch fish from shallow waters and will furiously defend its turf if any creature dares to enter it.