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 impoverished areas of the Cévennes mountains in south-central France in 1878. The terrain, with its barren rocky heather-filled hillsides, he often compared to parts of Scotland. The other principal character is Modestine, a stubborn, manipulative donkey he could never quite master. It is one of the earliest accounts to present hiking and camping outdoors as a recreational activity. It also tells of commissioning one of the first sleeping bags, large and heavy enough to require a donkey to carry. Stevenson is several times mistaken for a peddler, the usual occupation of someone traveling in his fashion. Some locals are horrified