Graft a patch of skin from one wild cheetah onto another, unrelated cheetah, and the recipient's body will not reject it. Researchers documented this in the 1980s, and the result told them something unsettling: the world's cheetahs are so genetically alike that, to an individual's immune system, every other cheetah reads as a twin. We've written recently about the species that have disappeared, both the confirmed extinct and populations crashing…
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