In 1996, Scottish researchers shocked the world with the news that they had cloned a sheep, which they dubbed Dolly. Due to progressive lung disease and arthritis uncommon for a sheep of her age, Dolly was euthanized at age 6. Dolly’s birth and death sparked a debate about the ethics of animal cloning that continues today. In light of the imminent demise of many critically endangered animals, some people see cloning as certain species’ only hope. Here’s a look at some of the lesser-known animals that have come into the world through cloning.