Dolly the sheep, the world's first cloned mammal, died yesterday, her creators at Scotland's Roslin Institute said. Veterinarians gave the world famous six-year-old sheep a lethal injection after they discovered signs of progressive lung disease. The birth of Dolly in July 1996 made headlines around the world and sparked criticisms and fears that human cloning would not be far off. Dr Harry Griffin, the head of the institute, said lung infections were common in older sheep. Dolly became a mother in April 1998 when she gave birth to her first lamb, a female called Bonnie.