Horse
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".
Deer
The subfamily Capreolinae consists of 9 genera and 36 species, while Cervinae comprises 10 genera and 55 species. Hydropotinae consists of a single species, the water deer ("H. inermis"); however, a 1998 study placed it under Capreolinae. The following list is based on molecular and phylogenetic studies by zoologists such as Groves and Grubb.The following is the classification of the extinct cervids with known fossil record:Deer were an important source of food for early hominids. In China, "Homo erectus" fed upon the sika deer, while the red deer was hunted in Germany. In the Upper Palaeolithic, the reindeer was the staple food for Cro-Magnon people, while the cave paintings at Lascaux in southwestern France include some 90 images of stags.