Researchers say that other cloned animals, including sheep, have been born with similar lung defects, but they say that overall the experiment was a major step forward in the effort to bring the ibex back to its mountain home. Says lead researcher Jose Folch: “The delivered kid was genetically identical to the bucardo. In species such as bucardo, cloning is the only possibility to avoid its complete disappearance”．

　　The failure to produce a viable clone from DNA that was frozen only a decade ago illustrates the difficulty researchers would face in trying to bring back species that have been extinct for decades, centuries, millennia, or epochs. Researchers have floated the idea of bringing back the Tasmanian Tiger, which went extinct in 1936, and others hope that woolly mammoths preserved in permafrost could one day be resurrected.Those efforts are still largely hypothetical. There are, however, other serious proposals for cloning endangered animals, such as the giant panda, the African bongo antelope, the Sumatran tiger and the pygmy hippo. The method's advocates believe it offers hope of preserving the genetic diversity of these animals before they die out.

　　【语篇解读】 科学家通过冻结的DNA成功地克隆了一只比利牛斯野生山羊。这

　　种野生山羊在2000年就已经灭绝了。

　　36．What do we know about the cloned ibex?

　　A．It died of lung disease.

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