The ancestors of today's crocodiles colonised the seas during warm phases and became extinct during cold phases, according to a new Anglo-French study which establishes a link between marine crocodilian diversity and the evolution of sea temperature over a period of more than 140 million years
New radiocarbon dating of 36 fossils (teeth fossils pictured) found in Alaska and Yukon suggest that mastodons became extinct tens of millennia before humans colonised North America
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