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,
When a white horse is not a horse term" and "shi" "solid; true, actual; fact, reality", and abstract "zhi" "finger; pointing; designation; universal" like "whiteness" and concrete "wu" "thing; object; particular" like a "white horse". The Chinese of "a white horse is not a horse" is "bai ma fei ma" 白馬非馬, whose meaning hinges upon the negative "fei" "not, is not; no, negative; oppose; wrong". The Classical construction "A "fei" B" "A非B" can ambiguously mean either "A is not a member of the class B" or "A is not identical to B". Interpreting this equivocation fallacy, A.C. Graham says this "white horse" vs. "horse" paradox plays upon the