Equus (genus) a female horse. With rare exceptions, these hybrids are sterile and cannot reproduce. A related hybrid, a hinny, is a cross between a male horse and a female donkey. Other hybrids include the zorse, a cross between a zebra and a horse and a zonkey or zedonk, a hybrid of a zebra and a donkey. In areas where Grévy's zebras are sympatric with plains zebras, fertile hybrids do occur. Equines have significant differences in size, though all are characterized by long heads and necks. Their slender legs support their weight on one digit (which evolved from the middle digits). Grévy's
When a white horse is not a horse When a white horse is not a horse When A White Horse Is Not A Horse (), also known as the White Horse Dialogue (), is a famous paradox in Chinese philosophy. Gongsun Long wrote this circa 300 BC dialectic analysis of the question 'Is "white horse not horse" permissibly assertible?'. The White Horse Dialogue ("Baima Lun") constitutes chapter 2 of the eponymous "Gongsun Longzi" "Master Gongsun Long", who was counted among the "School of Names" (aka "Logicians" or "Dialecticians") in the Hundred Schools of Thought. Most of Gongsun's writings have been lost and the received "Gongsun Longzi" text only