mules

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Hybrid Lizards Muscle Out Mom and Dad

Discovery of new salamanders’ ‘vigor’ is a scientific first

(Newser) - The offspring of California tiger salamanders and barred tiger salamanders are living proof that not all hybrids are mule-style genetic dead ends: They’re breeding their parents out of house and home. In a watershed instance of "hybrid vigor" among animals, Science reports, the progeny of two species for... More »

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