Colossal Biosciences said it used ancient DNA from the extinct species to create three dire wolf pups named Romulus, Remus and Khaleesi.

Dire wolves, made famous by “Game of Thrones,” went extinct some 13,000 years ago. Now, researchers have bred gray-wolf pups that carry genes of their ancient cousins.

Follow the progress of Romulus, Remus, and Khaleesi, three wolves that have become the stars of Colossal Biosciences' dire wolf de-extinction project.