It takes 24 million generations for mouse-sized mammals to evolve into elephants — but shrinking back is much faster.
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References
Evans, A. R., et al. Proc. Natl Acad. Sci. USA http://dx.doi.org/10.1073/pnas.1120774109 (2012).
Gingerich, P. D. Genetica 112–113, 127–144 (2001).
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Switek, B. Study measures mammalian growth spurt. Nature (2012). https://doi.org/10.1038/nature.2012.9931
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DOI: https://doi.org/10.1038/nature.2012.9931