Baby caecilians scrape the fatty skin from their mum's back.
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References
KupferA., et al. Nature, 440. 926 - 929 (2006).
ParkerH.W., et al. Nature, 178. 250 - 252 (1956).
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Ruttimann, J. Amphibian 'worms' feed young their own flesh. Nature (2006). https://doi.org/10.1038/news060410-7
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DOI: https://doi.org/10.1038/news060410-7