Which endangered species have been cloned?
The two wild species that have been cloned and are listed as endangered are the Przewalski’s horse (cloned in 2020) and the banteng (a Javanese bovine species, 2003). The two wild species that have been cloned and are listed as vulnerable are the guar (an Asian ox species, 2001) and the mouflon (a European sheep species, 2001). The bucardo, or Pyrenean ibex, was cloned in 2003 from frozen cells. It was (and still is) considered extinct (see Novak, 2018).
Other wild species that have been cloned are the coyote, wolf, white-tailed deer, bighorn sheep, African wildcat, sand cat, Northern leopard frog, Japanese pond frog, and Spanish ribbed newt.
To date, only the cloned guar, the bucardo, and the sand cat did not survive to adulthood. The cloned banteng, coyote, wolf, white-tailed deer, mouflon, bighorn sheep, African wildcat, Northern leopard frog, Japanese pond frog, and Spanish ribbed newt have survived to adulthood. The cloned Przewalski’s horse named Kurt was born August 6th, 2020, and is alive and healthy.
As you can see, most animals that have been cloned are placental mammals, owing to the fact that mammalian embryos can be created in vitro (in a petri dish) and implanted into surrogate mothers. Domestic mice, rats, rabbits, cats, dogs, cattle, pigs, goats, sheep, and horses are routinely cloned for commercial and research purposes. Most wild species that have been cloned are related to those cloned domestic species so that these domestic species can provide compatible surrogate mothers.