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
Leo Africanus Leo Africanus Joannes Leo Africanus (; born al-Hasan ibn Muhammad al-Wazzan al-Fasi, ; c. 1494 – c. 1554) was a Berber Andalusi diplomat and author who is best known for his book "Descrittione dell’Africa" ("Description of Africa") centered on the geography of the Maghreb and Nile Valley. The book was regarded among his scholarly peers in Europe as the most authoritative treatise on the subject until the modern exploration of Africa. For this work, Leo became a household name among European geographers. Most of what is known about his life is gathered from autobiographical notes in his own work. Leo