Hybrid (biology) are the mule, a cross between a female horse and a male donkey, and the hinny, a cross between a female donkey and a male horse. Pairs of complementary types like the mule and hinny are called reciprocal hybrids. Among many other mammal crosses are hybrid camels, crosses between a bactrian camel and a dromedary. The first known instance of hybrid speciation in marine mammals was discovered in 2014. The clymene dolphin ("Stenella clymene") is a hybrid of two Atlantic species, the spinner and striped dolphins. Cagebird breeders sometimes breed bird hybrids known as mules between species of finch, such
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