Are You My Mommy?

By Val Castronovo, Tam Gray, Daniel Levy, Ellin Martens, Michele Orecklin, Alice Park, Julie Rawe, Chris Taylor, Owen Thomas and Josh Tyrangiel

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.