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,
Male privilege women's rights but fail to realize that their privilege as a whole, is a part of the issue at hand. In both India and China, male offspring are privileged and favored over female children. Some manifestations of son preference and the devaluation of women are eliminating unwanted daughters through neglect, maltreatment, abandonment, as well as female infanticide and feticide despite laws that prohibit infanticide and sex-selective pregnancy termination. In India some of these practices have contributed to skewed sex ratios in favor of male children at birth and in the first five years. Other examples of privileging male offspring are