About Mammoths - University of California Museum of Paleontology
https://ucmp.berkeley.edu/mammal/mammoth/about_mammoths.html
WEBIn the early Pleistocene, about 1.8 million years ago, M. meridionalis took advantage of low sea levels (during an Ice Age) and crossed into North America via a temporary land bridge across the Bering Strait. The southern mammoth then radiated throughout North America. In the Middle Pleistocene, a new North American species evolved, the imperial mammoth, M. imperator (though some question ...
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