Which animal will always give birth to identical quadruplets?
Remarkably, there’s one animal out there that always has identical babies: the armadillo. The nine-banded armadillo is the only vertebrate that gives birth to identical quadruplets every time! A female produces a single egg that, once fertilized, splits into four genetically identical embryos that share one placenta. This process, through which multiple embryos develop from a single fertilized egg, is called polyembryony. How and why this unique pattern evolved and continues is a mystery. The word armadillo means "little armored one" in Spanish.
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