Reproductive isolation from a cross between a horse and a donkey or between a mare and a donkey, respectively. These animals are nearly always sterile due to the difference in the number of chromosomes between the two parent species. Both horses and donkeys belong to the genus "Equus", but "Equus caballus" has 64 chromosomes, while "Equus asinus" only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and do not
Equus (comics) had intended to use it against Nox, and that the King is to be executed, along with more than a dozen other members of the king's regime, Superman intervenes, feeling that the condemned men deserve a trial, again coming to blows with Equus, who carries out the execution. During the fight, Superman rips the claws right out of Equus' right arm, and seemingly defeating him. Superman then returns to Nox's palace, confronting him with the question of what he intends to do with the weapon, but Equus also appears, and ignores Nox's orders to stand down, saying that he is