The Koolasuchus lived in the rushing rivers that once separated Australia and Antarctica. But during the prehistoric period, they roamed in the environment of a temperate rainforest, they mostly lived in the rivers around the area. The koolasuchus is most closely related to the modern-day salamander. Some traits that are similar to the koolasuchus and the salamander are the skin tone and the shape of the body, though the salamander is much, much smaller than the koolasuchus. They also live in a similar climate being in the water and feeding off different water animals.

This is a sketch of the koolasuchus skeleton