What specific sire and dam pairing correctly defines an equine hybrid as a Zonkey?

Male zebra and female donkey

The precise nomenclature applied to zebra-donkey hybrids depends entirely on which species contributes the male parent and which contributes the female parent. For an offspring to be accurately designated a Zonkey, the sire must be a male zebra, and the dam must be a female donkey. This specific configuration is reportedly more common because male zebras exhibit a greater inclination to mate outside their species with donkeys. If the parental roles are reversed, resulting from a male donkey mating with a female zebra, the resulting hybrid receives a different designation, most commonly known as a Zedonk. This strict definition distinguishes the Zonkey from its closely related crossbreed relatives.