Digital scans suggest mammals have their ancestors to thank for their keen sense of smell.
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Rowe, T. B., Macrini, T. E. & Luo, Z.-X. Science 332, 955-957 (2011).
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Callaway, E. Mammalian brain followed a scented evolutionary trail. Nature (2011). https://doi.org/10.1038/news.2011.302