It's not just animals that can tell siblings from strangers.
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References
Dudley S. & File A. Biol. Lett., doi:10.1098/rsbl.2007.0232 (2007).
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Smith, K. Plants can tell who's who. Nature (2007). https://doi.org/10.1038/news070611-4
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DOI: https://doi.org/10.1038/news070611-4