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At the Croc World conservation centre in South Africa, Steve uses an infra-red camera to show us how cold-blooded crocs warm up and stay cool.
On Lake Jozini in South Africa, Steve and scientist Cormac Price find crocodiles living together and discovers how they communicate.
Steve explains how baby crocodiles hatch from eggs, and are closely guarded by their mother, and he catches a young croc at night - an absolute beauty!