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There are three reasons; Antarctica wasn't at the south pole in the early Jurassic and during the Cretaceous, there was more carbon dioxide in the atmosphere which pushed up temperatures so that dinosaurs were able to survive. Finally, some dinosaurs were believed to be warm blooded and have feathers which are adaptations to survive colder temperatures - birds, particularly penguins, live at the south pole today and there is strong evidence that modern birds have evolved from dinosaurs.

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