A DNA analysis shows that the number of creatures began to decrease much earlier than previously thought as the world's climate changed.
It also shows that there was a distinct population of mammoth in Europe that died out around 30,000 years ago.
The results have published in the Proceedings of the Royal Society B.
The view many researchers had about woolly mammoths is that they were a hardy, abundant species that thrived during their time on the planet."
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