On February 14, 2003 (January 14, 2003 in the lunar calendar), Dolly the cloned sheep was euthanized. Dolly the cloned sheep was born on July 5, 1996. Dolly is the first life that humans have successfully cloned using adult animal somatic cells for the first time. Its genetic mother is an ordinary white sheep. Bonnie, the first baby sheep, was born in April 1998, proving that cloned animals can also reproduce. Three more were born in 1999. On February 14, 2003, Dolly was diagnosed by a veterinarian as suffering from severe progressive lung disease. The so-called "progressive" disease means that the patient's condition continues to deteriorate and his life is at stake. In view of this situation, the institute decided to "euthanize" Dolly, who was only 6 years old. my country's first somatic cloned sheep is called Yangyang. It was born on June 22, 2000 and gave birth twice in August 2001 and February 2003.