Dallas-based biotech company Colossal has announced the birth of three pups bearing the DNA signatures of dire wolves, an iconic predator last seen roaming North America over 10,000 years ago.

Dallas-based Colossal Biosciences altered gray wolf DNA to breed the pups – just one of several species the company aims to bring back.

Two males—named Romulus and Remus, for the mythical brothers suckled by a she-wolf before founding ancient Rome—were born six months ago and are now living on an undisclosed wildlife refuge. One more female, Khaleesi—named for a Game of Thrones wolf—was born January 30, along with a second female who was born in January but died 10 days later.