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The world’s first cloned wolf, “Snuwolf,” was found dead last Saturday at Seoul Grand Park, a Seoul National University (SNU) veterinary team said Tuesday.

According to zoo staff, which had taken care of Snuwolf since 2007, it was found in its cage with its mouth covered with blood.

An initial necropsy showed no sign of foul play. An in-depth examination was conducted with the results expected in a month.

SNU Prof. Lee Byeong-chun, who cloned the animal back in 2005 from a cell of an adult female wolf, said it seems to be a natural death. “His organs were found to have been damaged, possibly due to the hot weather.”

However, there is some question whether cloned animals may suffer inexplicably from diseases or disorders that ordinary animals recover from.

Dolly, the first-ever cloned sheep in 1996, survived for only seven years, just a little more than the 12-year ordinary life expectancy of a sheep.

Dolly suffered from various diseases beginning three years after her “birth.” Research also shows cloned mice suffer from pneumonia and chronic liver failure, living only...