Thought this might be relevant to nationalism.
Even bacteria know their own.
“Often when we see these kinds of social incompatibilities, or greater cooperation between close relatives than between strangers, it’s interpreted in the context of kin selection theory, which posits that cooperation—at least within species—will evolve when there’s preferential interactions that occur between relatives that share genes for cooperation,” said Gregory Velicer of ETH Zürich, who led the work. “[We have found that] reduced cooperation between different types can arise not because of any selection for incompatibility, per se, but rather simply because you had these different complex social systems evolving independently of one another.”
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“We often think of [organisms that show kin selection] as having a very similar strategy,” said Rafael Rosengarten, a postdoctoral researcher who studies kin discrimination in Dictyostelium in the lab of Gad Shaulsky at Baylor College of Medicine, in Houston, Texas. “This study almost makes it seem like there really isn’t a strategy.”
https://archive.is/Zyr6t
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