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Mammoth researcher Professor Adrian Lister looks at Lyuba, a baby woolly mammoth considered to be the most complete example of the species ever found, at the Natural History Museum in London, May 19, 2014. Lyuba - "love" in Russian - was discovered frozen in clay and mud in Russia's Yamal Peninsula of Siberia in 2007 and is estimated to have died around 42,000 years ago at one month old.