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) completely disappeared from the face of the Earth (including his wife, Lois Lane), is traced to an unspecified country in the Middle East. Investigating, Superman intervenes in a civil war by using his speed to snatch all the guns from a group of men fighting one another. The fighting continues however, and in his continued quest to put an end to it, Superman confronts Equus, a large, monstrous, cybernetically enhanced humanoid creature whose claws are capable of piercing Superman's skin. General Nox, the leader of the rebels, puts an end to the fight between the two beings, telling Superman that