Which came first as bats evolved — flight or echolocation? Newly described fossils favour the flight-first hypothesis. But these creatures may have been otherwise equipped for flying at night.
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Speakman, J. A first for bats. Nature 451, 774–775 (2008). https://doi.org/10.1038/451774a
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DOI: https://doi.org/10.1038/451774a
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