Mammoths covered huge distances in their lifetime. The beasts traveled the equivalent of the circumference of the Earth almost twice, information from the study of a 17,000-year-old tusk has revealed.
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Mammoth tusks grow by age -- a bit like tree rings -- and analysis of chemical traces in each layer of growth can show surprising details. Researchers split lengthwise a 6-foot tusk that belonged to the University of Alaska Museum of the North and extracted 400,000 microscopic samples from the tusk.
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