Starbuck II is a calf that was cloned at the School of Veterinary Science, University of Montréal, Canada. Find out how they did it.

Reproductive cloning is already being used in a variety of fields such as research, medicine and breeding. However, if you tried to clone a sheep today, 97 per cent of your attempts would probably end in failure. While scientists may have mastered the techniques of cloning, they still do not fully understand the process. One of the techniques used, called nuclear transfer, means manipulating the embryo. This may be where errors occur in the operation and cause it to fail.

Sheep egg being injected with an embryonic cell during sheep cloning.

Megan and Morag, two Welsh mountain sheep cloned at the Roslin Institute in Scotland.