A Mammoth Task: Scientists Are Reviving Endangered Animals, and Awakening Ethical Questions

The next big thing in cloning is 'de-extinction' - reviving endangered species by creating hybrids that fuse a threatened or extinct animal with one that is thriving.

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In the 1960s, the world population of the northern white rhinoceros ‏numbered more than 2,000. At present, there are only seven left in the world: two in the San Diego Zoo Safari Park; one in the Dvur Kralove...