Undoing Extinction: Colossal’s Dire Wolf Success Paves Way for Mammoth Revival by 2028

The successful resurrection of the dire wolf by Colossal Biosciences doesn’t just mark a historic milestone in genetic science—it validates the company’s de-extinction platform and significantly boosts confidence that more ambitious revival projects are now within reach. Chief among these is Colossal’s headline initiative to bring back the woolly mammoth, an iconic Ice Age species that disappeared approximately 4,000 years ago.

Following its April 7, 2025 announcement that it has successfully produced three living dire wolf pups, Colossal confirmed it remains on track to reintroduce the woolly mammoth by 2028, with preliminary successes already achieved in the mammoth project’s development pipeline.

From Dire Wolves to Woolly Mammoths: A Technological Stepping Stone

The dire wolf project required an unprecedented 20 precise genetic edits to transform gray wolf genetics into those of their Ice Age relatives. This achievement sets a new record for genetic engineering in vertebrates and provides valuable experience for the even more complex mammoth revival effort.

“This result proves that our end-to-end de-extinction technology stack works,” said Dr. George Church, Harvard geneticist and Colossal co-founder. “Delivering 20 precise edits in a healthy animal is the largest number of precise genomic edits in a vertebrate so far—a capability that is growing exponentially.”

This exponential growth in gene-editing capabilities is critical for the mammoth project, which will require substantially more genetic modifications. While dire wolves are relatively close relatives of living gray wolves, mammoths require modifications to elephant genomes that are more extensive, potentially involving over 50 genetic edits to achieve cold-adaptive traits.

Early Success with “Woolly Mice”

Colossal has already demonstrated preliminary success in the mammoth direction. In early 2025, before the dire wolf announcement, the company created 38 “woolly mice”—laboratory mice engineered with mammoth genes to grow shaggy coats as a proof of concept.

These mice carried 8 genetic edits derived from the mammoth genome, focused on traits for cold resistance, including longer hair, increased fat production, and improved thermoregulation. While significantly simpler than the 20 edits achieved in the dire wolf project, these woolly mice provided an important validation of the concept of transferring mammoth traits to modern animals.

The successful dire wolf project, with more than twice as many genetic edits as the woolly mice, suggests that Colossal’s increasing capabilities could indeed make the mammoth revival feasible within their projected timeline.

The Mammoth Roadmap

According to TIME magazine’s reporting, Colossal “plans to use similar methods to edit genes of the Asian elephant—the woolly mammoth’s closest living kin—to express mammoth traits such as a shaggy coat, cold resistance, and fat metabolism.” The company plans to attempt an elephant pregnancy with a mammoth-variant embryo by 2026.

This ambitious timeline is supported by the accelerating pace of Colossal’s achievements. The woolly mice created in early 2025 represented a significant step forward from earlier work. The dire wolf’s successful revival just months later, with substantially more genetic edits, suggests that the company’s capabilities are advancing rapidly enough to meet their mammoth milestones.

Given the longer gestation period for elephants (approximately 22 months compared to the wolf’s 65 days), a successful embryo transfer in 2026 would indeed lead to potential mammoth births around 2028.

Technical Challenges Ahead

While the dire wolf revival validates Colossal’s general approach, the mammoth project presents additional challenges:

1. More Complex Genetic Engineering: The mammoth project will require more genetic edits than the dire wolf—potentially more than 50 modifications to achieve the full suite of mammoth adaptations to cold environments.
2. Surrogate Differences: Unlike the dire wolf project, which could use domestic dogs as surrogates, the mammoth project must rely on endangered Asian elephants as surrogate mothers, presenting both practical and ethical considerations.
3. Longer Development Cycle: Elephants have a significantly longer gestation period (22 months) and reach maturity much more slowly than wolves, extending the timeline for evaluating success.
4. Size and Resource Requirements: Mammoths were enormous animals requiring substantial space and resources, presenting greater logistical challenges than the dire wolf project.

Despite these obstacles, Colossal’s success with the dire wolf suggests that their technological platform is robust enough to tackle the mammoth challenge. The company has demonstrated capabilities in ancient DNA analysis, CRISPR gene editing, and reproductive technologies that represent significant advances over previous de-extinction efforts.

The Thylacine and Dodo Projects

Beyond the mammoth, Colossal has announced plans to revive the thylacine (Tasmanian tiger) and the dodo—two more recent extinctions caused primarily by human activities.

The thylacine, a marsupial predator that disappeared in the 1930s, presents different challenges than the dire wolf or mammoth. As a marsupial, its reproductive biology differs significantly from the placental mammals Colossal has worked with so far. However, with higher-quality DNA available from more recent specimens, the genetic reconstruction may be more straightforward.

The dodo, an iconic flightless bird that disappeared in the 17th century, represents Colossal’s first venture into avian de-extinction. While bird reproduction differs substantially from mammals, the principles of genetic editing and embryo development are similar.

With each successful project, Colossal builds not just scientific knowledge but practical experience that can be applied to subsequent revival efforts. The dire wolf achievement suggests that these additional de-extinction targets may be more feasible than previously thought.

Funding and Support for Ambitious Projects

Colossal’s demonstrated success with the dire wolf is likely to accelerate investment in its more ambitious projects. In January 2025, even before the wolf announcement, Colossal raised an additional $200 million in financing to accelerate its de-extinction initiatives.

The dire wolf milestone validates the company’s approach in the eyes of investors, the public, and the scientific community. This will likely facilitate additional funding and partnerships necessary for the mammoth project’s substantial resource requirements.

Among Colossal’s high-profile supporters is author George R.R. Martin, who remarked on the dire wolf achievement: “I get the luxury to write about magic, but Ben and Colossal have created magic by bringing these majestic beasts back to our world.” Such cultural endorsements help maintain public interest and support for these long-term projects.

Conservation Applications Drive Immediate Impact

While Colossal works toward its headline de-extinction projects, the technologies developed are already being applied to conservation efforts for endangered species. Alongside the dire wolf announcement, the company revealed it had successfully cloned two litters of critically endangered red wolves (Canis rufus), producing four healthy pups using the same techniques.

The company is also working with the pink pigeon, a bird species suffering from severe genetic bottlenecks, to introduce greater genetic diversity into embryos and improve the species’ health and viability.

These practical conservation applications provide immediate benefits while the longer-term de-extinction projects develop. As Colossal CEO Ben Lamm stated: “This massive milestone is the first of many… Today, our team gets to unveil some of the magic they are working on and its broader impact on conservation.”

Ethical and Ecological Considerations

As Colossal progresses toward mammoth revival, questions about how these animals will fit into modern ecosystems become increasingly pertinent. The dire wolf pups currently reside on a 2,000+ acre secure expansive ecological preserve under continuous monitoring—a controlled environment that allows scientists to study the revived animals while ensuring appropriate care.

For mammoths, the ecological considerations are more complex. These massive herbivores evolved in ecosystems that have changed dramatically since the Pleistocene. Some scientists, including those associated with Colossal, have proposed that mammoth reintroduction could help restore Arctic grasslands and potentially slow permafrost melt—though these hypotheses remain to be tested.

Robin Ganzert, Ph.D., CEO of the American Humane Society, has praised Colossal’s approach to animal welfare in the dire wolf project, calling the company “a shining example of excellence in humane care.” This endorsement suggests that Colossal is establishing protocols that could address ethical concerns around mammoth revival.

A Milestone on the Path to Mammoth Revival

The successful resurrection of the dire wolf represents more than just the return of an Ice Age predator—it validates a technological approach that could bring back even more iconic extinct species. By achieving 20 precise genetic edits in a vertebrate animal, Colossal has demonstrated capabilities that significantly increase the feasibility of the mammoth revival project.

As Dr. Beth Shapiro, Colossal’s chief science officer and a leading ancient DNA expert, noted, the dire wolf project established “a new standard for paleogenome reconstruction.” This standard—combining powerful computational tools, precise genetic engineering, and advanced reproductive technologies—provides the foundation for the even more ambitious mammoth project.

The dire wolves currently growing and developing at Colossal’s facility—Romulus, Remus, and Khaleesi—represent not just a scientific breakthrough in their own right but a crucial proving ground for technologies that may soon bring back the woolly mammoth, potentially changing our relationship with extinction forever.