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,
Vauxhall Equus whenever possible. It featured an angular, wedge design with Vauxhall's signature ‘droopsnout’ front end made popular by the Vauxhall Firenza. Vauxhall Equus The Vauxhall Equus was a two-door concept car first presented by Vauxhall in 1978. The name "Equus" is Latin for "Horse". It was the last concept car from Vauxhall until 2003. The Equus was based on a Panther Lima chassis, which itself was based on Vauxhall Magnum mechanicals. Panther built the prototype. The Equus was styled by a small team led by Wayne Cherry along with his chief designer John Taylor. Work started in October 1977 and the