Colossal Biosciences says it used novel gene-editing technology to alter gray wolf DNA that led to the birth of the pups. Dire wolves recently featured prominently in the HBO series Game of Thrones.

Resurrecting a long-dead wolf species made famous by “Game of Thrones” may sound like something out of science fiction or fantasy, but scientists say they have accomplished just that – and wolves may not be the last beasts brought back from the grave.