Koolasuchus inhabited rift valleys in southern Australia during the Early Cretaceous (125 million years ago). It lives in the rainforest which had hot summers to freezing cold winters with no light at all. The types of plants that lived there were bryophytes, lycophytes and ferns and gymnosperms. Their fossils were found on the beaches and coasts of Australia. As the climate warmed they were competing with the crocs, and the crocs outlived them. Leaellynasaura (Lee-en-a-soras), polar allosaur, and muttaburrasaurus.