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,
Travels with a Donkey in the Cévennes Travels with a Donkey in the Cévennes Travels with a Donkey in the Cévennes (1879) is one of Robert Louis Stevenson's earliest published works and is considered a pioneering classic of outdoor literature. Stevenson was in his late 20s and still dependent on his parents for support. His journey was designed to provide material for publication while allowing him to distance himself from a love affair with an American woman of which his friends and families did not approve and who had returned to her husband in California. "Travels" recounts Stevenson's 12-day, solo hiking journey through the sparsely populated and