One of of the world's first two cloned wolves has died due to unknown causes, reports the Korea Times. Snuwolf, 4, was found dead at South Korea's national zoo. Her identical sister, Snuwolffy, remains healthy. "Snuwolf had been in good condition," said Prof. Shin Nam-sik,
a leader of the team that cloned the pair. "Wild animals often die suddenly. We will know the cause of death with the results of the autopsy."