Koolasuchus sciifii is a species of brachyopoid temnospondyl in the family Chigutisauridae that originally lived from Victoria, Australia around 120 million years ago to the Aptian stage of the Early Cretaceous, as an extinct species of Koolasuchus, and was once extinct, but has since been brought back from extinction by SciiFii. It is currently illegal to own as pets in almost everywhere on Earth, due to their predatory habits and being dangerous, except in Australia and New Zealand, where Koolasuchus sciifii are legal to keep as pets, just like in Florida, where alligators can be legally kept as pets, resulting in some careless pet owners releasing babies of Koolasuchus sciifii into the Australian and New Zealand ecosystem, thus establishing thriving and breeding feral populations in both countries. Koolasuchus sciifii is an aquatic temnospondyl growing to be around 4 to 5 metres (13 to 16 ft) in length and with a weight up to 500 kilograms (1,100 lb). Like other chigutisaurids, it has a wide, rounded head and tabular horns projecting from the backside of the skull. The natural habitats of the Koolasuchus sciifii includes rivers, lakes, and fast-moving streams. As a large aquatic predator, it is more similar in lifestyle to crocodilians than to native modern giant salamanders. When the autumn arrives in cold environments, the Koolasuchus sciifii travels into the small ponds to spend the winter there, but when the weather warms up due to spring arriving in those areas, the Koolasuchus sciifii travels from the pond and move to a bigger river, lake, or fast-flowing stream, and the cycle continues in changing seasons in those environments. The conservation status of Koolasuchus sciifii is Least Concern due to successful conservation efforts, the animal's wide range, and its tolerance to most of human activities, including, just like American alligators in North America, being able to adapt to life in the cities and suburbs.