Donkey the environment. They may compete with livestock and native animals for resources, spread weeds and diseases, foul or damage watering holes and cause erosion. Few species of ass exist in the wild. The African wild ass, "Equus africanus", has two subspecies, the Somali wild ass, "Equus africanus somaliensis", and the Nubian wild ass, "Equus africanus africanus", the principal ancestor of the domestic donkey. Both are critically endangered. Extinct species include the European ass, "Equus hydruntinus", which became extinct during the Neolithic, and the North African wild ass, "Equus africanus atlanticus", which became extinct in Roman times. There are five subspecies
Titus Sextius Africanus Titus Sextius Africanus Titus Sextius Africanus was a Roman senator who was deterred by Agrippina the Younger from marrying Junia Silana. He served as a suffect consul in 59 AD. In 62 AD, he took the census in the provinces of Gaul, together with Quintus Volusius Saturninus and Marcus Trebellius Maximus. Saturninus and Africanus were rivals, and both hated Trebellius, who took advantage of their rivalry to get the better of them. His name occurs in a fragment of the Fratres Arvales. Titus Sextius Cornelius Africanus, who served as a consul with Trajan in 112 AD, was related to Africanus.