Flying fantasies confront us at every turn. And there is evidence it’s been this way for a very long time. A recent fossil discovery revealed that the first mammals capable of gliding flight lived many millions of years ago. The fossil in question belongs to a Chinese squirrel-like creature, which possessed a stretchy membrane between its front and back legs that served as wings. Some scientists believe the animal may have lived as long ago as 164 million years, meaning that mammals were taking to the air before birds.
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