Teaching embryos the password for food helps parents avoid having to feed imposters.
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References
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Colombelli-Négrel, D. et al. Curr. Biol. http://dx.doi.org/10.1016/j.cub.2012.09.025 (2012).
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Corbyn, Z. Wrens teach their eggs to sing. Nature (2012). https://doi.org/10.1038/nature.2012.11779
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DOI: https://doi.org/10.1038/nature.2012.11779