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We’re back in time a little over 50 million years. The dinosaurs have been gone for only 13 or 14 million years. Gone too are the great marine lizards. Along the shoreline of the shallow Tethys Sea, on the south coast of the landmass of Eurasia, mammals are turning their interest to an abundant realm long denied them. In nature, no available resource is ever ignored for long, and a coyote-sized animal named Pakicetus is taking the first tentative steps into the warm waters of streams and deltas in its (uppermost middle) Eocene world.
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