However, even near water the dinosaur proved to be too fast for Koolasuchus and the attack failed. Later, more Koolasuchus appeared in the river and one of them tried to attack a Leaellynasaura youngster. Koolasuchus' size (4 m.) comparison with a modern crocodile (5 m.) and human (roughly 2 m.) from BBC WF site. However, it was harmless to them on land and they soon ignored it. As the weather warmed up, the giant amphibian emerged from the pond and moved to a bigger river, startling more of Leaellynasaura. In the beginning of the episode one Koolasuchus was shown eating a dead Leaellynasaura that died in winter. Series Walking with Dinosaurs Spirits of the Ice Forest But in prehistoric Antarctica, the waters got too cold for crocodiles and the world's last Koolasuchus survived, still patrolling the waterways, just as their ancestors did 150 million years before them. During their time, in most parts of the world, competition from crocodiles had begun to drive these magnificent amphibians to extinction. These bizarre looking creatures were relics from a timeīefore dinosaurs. During winter, they hibernated in swamps in forests and spent their summer in rivers. In the water Koolasuchus was lethal, but on land their legs had trouble dragging their bulk around…and they were no threat to even the little dinosaurs. A giant amphibian of the Mid-Cretaceous, Koolasuchus had massively powerful jaws, weighed about half a ton…and were carnivores.
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