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The Steppe mammoth ( Mammuthus trogontherii ) is the most complicated of all mammoths. Experts agree that it evolved from the Southern mammoth, and spread throughout Eurasia. But there is a debate over whether the Steppe mammoth spread throughout North America, too. Some say that in North America there are two distinct species, the Columbian and Imperial mammoth. But there are those who believe that the Columbian and Imperial mammoth are the same animal - the North American Steppe mammoth.
