Ten Years of Cloning

BREEDING 2.0
In 2003, researchers at University of Idaho and Utah State University finally found a way to get mules to reproduce. Because they are the sterile result of breeding two separate species (a horse and a donkey), mules normally can't have offspring. Cloning, however, makes it possible for mules to sire, after a fashion, more of their own, like Idaho Gem, above.

• Primates in Peril