Ghosts of the Ice Age: Inside the Race to Bring Extinct Animals Back

For as long as species have vanished from the Earth, extinction has meant forever. Now a single Texas company is doing its level best to prove otherwise. In a story that sounds lifted straight from the pages of science fiction, scientists have coaxed living, breathing dire wolves back into the world after some twelve thousand years, and the woolly mammoth may well be next in line.

The wolf that time forgot

The dire wolf, a hulking Ice Age predator recently immortalised by a certain fantasy television series, died out roughly twelve and a half thousand years ago. In 2025, the biotechnology firm Colossal Biosciences stunned the world by announcing it had brought a version of the great beast roaring back to life.

The recipe behind it was genuinely extraordinary. Scientists extracted ancient DNA from a thirteen thousand year old tooth and a far older ear bone, painstakingly read the dire wolf's genetic blueprint, then made twenty precise edits across fourteen genes in the living cells of its closest cousin, the humble gray wolf.

The results are now padding around a private preserve somewhere in the American West. Two males, named Romulus and Remus, were born in late 2024, followed by a female called Khaleesi, each of them destined to grow to a formidable six feet in length and around a hundred and fifty pounds in weight.

Not quite a clone

It is worth being very clear about what these animals actually are, and are not. Colossal did not simply splice ancient DNA back together to clone a dire wolf outright. Instead, it rewrote the genetic code of a gray wolf until it closely matched, producing what is best described as an engineered proxy of the original creature.

That fine distinction has fuelled some fierce debate. To its supporters, a creature carrying the dire wolf's key traits is a genuine resurrection in all the ways that truly matter. To the sceptics, it remains a modified gray wolf in a convincing costume, a clever lookalike rather than a true return from the dead.

Next stop, the mammoth

The dire wolf, though, is really only ever the opening act. Colossal's headline ambition has always been the woolly mammoth, the shaggy giant that once roamed the frozen north before disappearing several thousand years ago around the close of the last great Ice Age.

The plan is to engineer a cold adapted version of its closest living relative, the Asian elephant. The company expects the very first embryos to be ready around 2026, with living calves potentially walking the tundra by 2028, a timeline that many outside experts still regard as strikingly and perhaps recklessly bold.

There has already been one curious proof of concept. In early 2025 the team unveiled a woolly mouse, an ordinary lab mouse engineered with the long golden coat and the fat storing biology of a mammoth, a tiny, whiskered hint of exactly what they hope one day to achieve on a far grander scale.

A whole menagerie

The company's ark most certainly does not stop at wolves and elephants. It is now juggling five separate de-extinction projects all at once, with the Tasmanian tiger, the dodo and the giant flightless moa of New Zealand all lined up alongside the mammoth and the resurrected dire wolf.

Some are moving along faster than others. The Tasmanian tiger effort is reportedly running ahead of schedule, its full genome already sequenced and vital stem cells created, while the dodo team has finished mapping high quality genomes and begun carefully editing genes inside the germ cells of birds.

The billion dollar bet

Reviving the dead is not remotely cheap, and yet investors have proved remarkably willing to fund the attempt. Colossal has soared to what the industry likes to call decacorn status, valued at a staggering ten billion dollars or more, making it one of the most richly backed biotech ventures anywhere on the planet today.

The company insists all of this is about a great deal more than spectacle. It argues that the very tools it is forging, from advanced gene editing to reproductive technology, could help rescue endangered species teetering on the brink right now, turning de-extinction into a springboard for much wider conservation.

Miracle or mirage

Not everyone, however, is convinced the whole endeavour is truly wise. Critics warn of unpredictable ecological knock on effects, thorny questions of animal welfare, and the real risk that flashy resurrection projects could quietly distract from the harder, far less glamorous work of protecting the species we still have.

What is beyond any dispute is that a line has now been firmly crossed. Whether you see the results as true de-extinction or merely clever imitation, animals shaped by the genes of long dead creatures are alive and growing today, and the once absolute wall between extinct and living has developed its very first real cracks.