https://scitechdaily.com/52-million-year-old-bat-skeleton-unveils-new-species-and-clues-to-evolution-of-flying-mammals/
52-million-year-old fossils support idea that bats diversified rapidly on multiple continents during the Eocene. Scientists have discovered a new bat species, Icaronycteris gunnelli, based on the oldest bat skeletons ever found in Wyoming's Green River Format…
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