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
Who is a Jew? horse and a donkey, and in both unions the offspring are judged matrilineally. Second, the Tannaim may have been influenced by Roman law, which dictated that when a parent could not contract a legal marriage, offspring would follow the mother. However Leviticus 24:11, Ezra 9-10, and Nehemiah 13 seem to indicate that matrilineal descent was recognized and patrilineal descent was rejected in Biblical times as well. All Jewish religious movements agree that a person may be a Jew either by birth or through conversion. According to "halakha," a Jew by birth must be born to a Jewish mother. "Halakha" states