The giant Cretaceous temnospondyl Koolasuchus inhabited rivers and streams in Australia. They weren't filled with giant reptiles like crocodiles, as they are today because Koolasuchus was capable of dealing with the cooler climate in Australia during the Cretaceous.
Antarctica was very much located at or close to the South Pole as the planet entered the Cretaceous Period. But there were no polar ice caps anywhere on Earth at least for a significant portion of this time. And forests reached as far south as the South Pole.
Koolasuchus An amphibian with a jaw that measured one meter in diameter and weighed half a tonne lived in Victoria, Australia's lakes and rivers during the Cretaceous period. It was the size of a crocodile and could reach lengths of five meters (from snout to tail).
Koolasuchus thrived in the milder environment. It is believed that crocodile populations increased as the climate warmed, eventually challenging Koolasuchus in Australian waters, and eventually making them disappear.
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