Donkey
Donkeys can interbreed with other members of the family Equidae, and are commonly interbred with horses. The hybrid between a jack and a mare is a mule, valued as a working and riding animal in many countries. Some large donkey breeds such as the Asino di Martina Franca, the Baudet de Poitou and the Mammoth Jack are raised only for mule production. The hybrid between a stallion and a jenny is a hinny, and is less common. Like other inter-species hybrids, mules and hinnies are usually sterile. Donkeys can also breed with zebras in which the offspring is called a zonkey (among other names).
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.