Jazz, an endangered African wildcat, last week became the first mammal to be born from a frozen embryo implanted in a house cat. But she's not the first rare animal to use a common species' womb. A bongo antelope was born to an eland in 1984 at the Cincinnati Zoo, and two Holsteins, one in Cincinnati and one at the Bronx Zoo, have given birth to gaur, a rare species of wild cattle.
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