Proterosuchus is a large reptile. It lived during the early Triassic and was the largest reptile at the time. It lived in and around rivers like crocodiles. It baths in the sun to heat its bodies. In Walking With Monster they where depicted as having a meal at least once a year due to the movement of a herd of Lystrosaurus. It was a ambush predator hiding in the river until the prey gets to close.