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Scientists have come up with a new on why woolly mammoths became 21,000 years ago. Up until now, people have believed that mammoths, the 3-metre-high of elephants, died out because they were to extinction. New research shows they ran out of grass, and that was by global warming 21 millennia ago. Researchers from the UK’s Durham University suggest the hairy dinosaurs to death because forests took over the grasslands they needed to . As the Earth became warmer and wetter, forests spread and the mammoth had fewer areas to . "Mammoths had roamed and their way across many parts of Europe," said lead researcher Professor Brian Huntley.

Professor Huntley said what happened to the mammoths in prehistoric is a warning of what might happen in the to today’s large herbivores. “This was a time of major environmental change and of habitat that may have led to the extinction of…-species that many parts of the planet,” he said. He had a warning about the of today’s large animals: "It is food for thought in these times of global warming and human-induced change." Other creatures also to become extinct due to change were the cave lion, giant deer, woolly rhino and the cave bear. The research team believe today’s elephants and rhinoceroses could a similar .