The concept of de-extinction isn't new. The first attempt at bringing back a lost species, a wild mountain goat called a bucardo, was made in 2003 after it had gone extinct just three years earlier. The cloned embryo of the bucardo, or Pyrenean ibex, was grown in the lab and then brought to term in the uterus of a goat. It survived for only a few minutes due to defects in its lungs.
Attempts to revive the woolly mammoth—or some genetically modified version of it—have been going on for even longer.
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