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SAN FRANCISCO -- Sixteen thousand years ago, woolly mammoths , Beringian lions and short-faced bears roamed a grassy steppe that stretched across North America into Alaska. [More]

CT scan of baby woolly mammoth named Lyuba LAS VEGAS Computed tomography (CT) scans of two extraordinarily well-preserved baby woolly mammoths from Siberia have yielded startling new insights into these iconic Ice Age beasts. Previously examinations of the external features of the mammoths suggested that the two creatures were quite similar, exhibiting the same developmental stage and similar age at death. But the new full-body scans the first ever obtained for largely intact mammoths tell a different story.

By Ewen Callaway of Nature magazine Woolly mammoths, woolly rhinos and other large animals driven to extinction since the last ice age each succumbed to a different lethal mix of circumstances.