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Pictjune 06-04-2015 01.jpg
2.39 MB - 5083 x 7003
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Description
Comparison of the North American beaver, Castor canadensis, and its Early Oligocene ancestor, Microtheriomys brevirhinus, from John Day Fossil Beds, Oregon. M. brevirhinus' descendants would then emigrate into Eurasia, and later, by the Pleistocene, emigrate back into North America.
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