Horse outward similarity is an unreliable measure of relatedness. Besides the horse, there are six other species of genus "Equus" in the Equidae family. These are the ass or donkey, "Equus asinus"; the mountain zebra, "Equus zebra"; plains zebra, "Equus quagga"; Grévy's zebra, "Equus grevyi"; the kiang, "Equus kiang"; and the onager, "Equus hemionus". Horses can crossbreed with other members of their genus. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, a hinny, is a cross between a stallion and a jenny (female donkey). Other hybrids include the zorse,
Scipio Africanus has been discovered and is open to the public, but it is not believed that Scipio Africanus was interred there. The possibility exists that he was returned to Rome and laid to rest there in a still undiscovered crypt. Livy says in his "History of Rome" that statues of Scipio Africanus, Lucius Scipio and the Roman poet Ennius (a friend of the family) were present at the Tomb of the Scipios when he visited it. However, Seneca (Epistle 86.1), having moved into the villa at Liternum that used to belong to Scipio Africanus, tells us that he has done 'reverence