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,
The Adventures of a Donkey received recognition in contemporary reviews. According to the 1924 edition of the "Saturday Review of Politics, Literature, Science and Art", this was due to Argus not being as 'widely read compared with very many of her contemporaries.' The general consensus was that it was a brilliant attempt at opening the eyes of children to the maltreatment of the donkey, which was appropriate as the donkey had risen in fashion during the early 1800s. "The Lady's Monthly Museum" described it as, '[a] vehicle for conveying sound morals and instruction to the youthful mind, under the guise of innocent pleasantry.' And "The