According to a report from the Society of Vertebrate Paleontology, Earth has undergone numerous dramatic changes in climate since the dinosaurs went extinct some 66 million years ago. One of the warmest periods was the early Eocene Epoch, 50 to 53 million years ago. All through this interval, North American mammal communities were rather distinct from those of today.
This distinction is described in a study published in the latest issue of the Journal of Vertebrate Paleontology, which describes a prehistoric hedgehog and tapir that lived in what is now Driftwood Canyon Provincial Park, British Columbia, some 52 million years ago.
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