When Rodents Marched Into Paris

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Science  29 Oct 2010:
Vol. 330, Issue 6004, pp. 583
DOI: 10.1126/science.330.6004.583-b

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Some of the first settlers of Paris were chipmunk-sized mammals that are among the world's oldest rodents, and the oldest in Europe. At the meeting, researchers announced the discovery of fossil teeth of the squirrel-like rodents on the grounds of a quarry in northern Paris. The discovery of two definitive rodent teeth, as well as part of a primitive carnivore's jaw, is an important clue to the mystery of how the first modern mammals spread around the globe, replacing archaic animals and ushering in the age of modern mammals.