The first cloned mammals were two female Dolly the Sheep, born in 1996. Dolly was created using a process called somatic cell nuclear transfer, which involves transferring the nucleus of an adult cell into an egg cell that has had its nucleus removed. Dolly was the first mammal to be successfully cloned from an adult somatic cell, and her birth marked a major breakthrough in cloning technology. The two ewes, as female sheep are known, were the first cloned mammals to be born.