Other than their peculiar looks, it is their reproductive system that really surprises zoologists, geneticists, and me: in every pregnancy, the nine-banded armadillo (genus Dasypus) delivers four genetically identical quadruplets, thus providing us humans with exciting material for scientific, behavioral or medical tests on identical individuals.
This is the only manifestation of polyembryony in mammals, and within the animal world it is also observed in parasitoid wasps.
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