When people first arrived in Australia, they found unique plants and animals. It must have been like entering a new world. There were giant marsupials (mammals that carried their young in a pouch, such as kangaroos), giant monotremes (mammals that lay eggs, such as echidnas) and different types of birds (including emus and brolgas). There were also other giant animals that no longer exist. We call these extinct giant animals megafauna. Unlike Africa and Asia, where the top predators were mammals, in Australia, giant reptiles ruled.
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