Consider also that horses and donkeys are much closer to each other than humans ever were to any hominid, and that all mules are sterile...
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Consider also that horses and donkeys are much closer to each other than humans ever were to any hominid, and that all mules are sterile...
Read Eugene McCarthy, who has studied hybridization his entire career, writing the bible of Avian hybridization accounted the definitive work on the topic, and you will discover that a) not all mules are sterile, and b) even species that are sexually sterile, or even have no males, can survive and even become fertile, in time.