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).
Caviinae
Caviinae is a subfamily uniting all living members of the family Caviidae with the exception of the maras, capybaras, and "Kerodon". The subfamily traditionally contained the guinea pig or cavy-like forms along with the cursorially adapted (running) "Kerodon". Molecular results suggest the Caviinae as so defined would be paraphyletic and "Kerodon" is more closely related to maras and capybaras than to other caviines. This led Woods and Kilpatrick (2005) to unite "Kerodon" and capybaras into the subfamily Hydrochoerinae within the Caviidae. These studies also suggest "Microcavia" and "Cavia" are more closely related to one another than either is to "Galea".