Few announcements in biotech have stirred up as much excitement—and as much pushback—as the claim that dire wolves are back. Colossal Biosciences says it has created three wolf pups that resemble the extinct predator, but many scientists say those pups are something else entirely.

4 related posts

Extinction date: 13,000 years ago ·
First de-extinction announcement: October 1, 2024 ·
Number of pups: 3 ·
Company: Colossal Biosciences ·
Species claimed: Aenocyon dirus (dire wolf)

Quick snapshot

1Confirmed facts
2What’s unclear
  • Whether the pups share enough ancient DNA to be called dire wolves (The Niche (stem cell blog))
  • Whether independent scientists will accept Colossal’s definition of de-extinction (UMass D Torch)
  • Timeline for any future wild reintroduction (VPM / NPR)
3Timeline signal
  • 13,000 years ago: Dire wolves go extinct (VPM / NPR)
  • October 1, 2024: Colossal announces pups (UMass D Torch)
  • April 8, 2025: BBC publishes expert dispute (detailed in content plan) (VPM / NPR)
4What’s next
  • Pups could be bred to produce second generation (The Niche)
  • Bluebuck de-extinction target year 2030 (VPM / NPR)
  • Woolly mammoth and thylacine projects ongoing (VPM / NPR)
Key facts about the dire wolf de-extinction project
Fact Value
Extinction Date ~13,000 years ago (VPM / NPR)
De-Extinction Announcement October 1, 2024 (UMass D Torch)
Number of Pups 3
Pup Names Romulus, Remus, Khaleesi
Company Colossal Biosciences
Scientific Name Aenocyon dirus
Expert Verification Disputed (The Niche)

Have dire wolves actually been brought back?

The evidence shows a gap between the company’s claims and what independent scientists accept as de-extinction.

What did Colossal Biosciences announce?

  • On October 1, 2024, Colossal released a video claiming the birth of three dire wolf pups — Romulus, Remus, and Khaleesi — using gene editing (UMass D Torch).
  • The company’s CEO Ben Lamm said the team had “returned the dire wolf to its rightful place in the ecosystem” (UMass D Torch).
  • The actual process: 15 genes in gray wolves were edited to produce traits thought to match the extinct dire wolf (The Niche).

Why do experts dispute the claim?

  • Independent scientists point out that dire wolves (Aenocyon dirus) are a separate lineage with no evidence of interbreeding with gray wolves (UMass D Torch).
  • A professor called Colossal’s claim “colossal baloney” and said the hype harms real science (The Niche).
  • Critics argue that what Colossal created is a genetically modified gray wolf, not a true de-extinction (VPM / NPR (public radio)).
The catch

The gap between Colossal’s marketing and the scientific consensus creates a real risk. Media reports have sometimes led officials to believe true dire wolves are back, while experts see a modified wolf with a few ancient tweaks.

The implication: Colossal has produced an impressive genetic feat, but calling it de-extinction may be misleading. The pups are not a re-created ancient species but a modern hybrid with edited genes.

What killed the dire wolf?

When did dire wolves go extinct?

  • Dire wolves disappeared around 13,000 years ago, at the end of the Pleistocene epoch (VPM / NPR).

What caused their extinction?

  • Possible causes include climate change that shrank their prey base, and competition with gray wolves as well as early humans (UMass D Torch).
  • Genetic isolation likely made them more vulnerable to environmental shifts (VPM / NPR).
Bottom line: Dire wolves died out naturally, and the exact combination of factors is still debated. Their extinction serves as a reminder that even apex predators are not immune to ecological change.

How big was the dire wolf?

Dire wolf size vs gray wolf size

The extinct dire wolf was built differently from its modern relative. Here’s a comparison based on fossil records and expert estimates:

Dire wolf vs gray wolf: size and build
Trait Dire wolf (Aenocyon dirus) Gray wolf (Canis lupus)
Average weight 150–200 lbs (VPM / NPR) 70–120 lbs
Skull width Broader, more robust (VPM / NPR) Narrower
Tooth size Larger, more powerful (VPM / NPR) Smaller
Shoulder height ~30 inches estimated 26–32 inches
Body length ~5 feet estimated 4–5 feet

The trade-off: Colossal’s edited pups may look a bit more dire-like, but they lack the full size and bone structure of the original. Size alone doesn’t make a dire wolf.

What is the latest update on the dire wolf de-extinction?

Where are the pups now?

  • The three pups — Romulus, Remus, and Khaleesi — are housed at a confidential facility in the United States (VPM / NPR).
  • All three have reached reproductive age, which would allow for a second generation if breeding is attempted (VPM / NPR).

Can the pups reproduce?

  • Yes, they are sexually mature, but no breeding has been announced yet (The Niche).
  • Future plans reportedly include potential reintroduction to wilderness areas, though no timeline or location has been confirmed (VPM / NPR).
What to watch

If Colossal breeds the pups and the offspring inherit the edited traits, the company may argue that it has established a self-sustaining population. Critics will watch closely whether those offspring are genetically stable and truly resemble ancient dire wolves.

For now, the pups are alive and healthy, but the scientific community remains unconvinced that they represent the actual dire wolf species.

What other extinct animals is Colossal planning to bring back?

Bluebuck de-extinction goal for 2030

  • Colossal has set a target to revive the bluebuck, an extinct antelope, by 2030 (VPM / NPR).
  • The species was driven to extinction in the 1800s.

Other projects: woolly mammoth, Tasmanian tiger

  • Woolly mammoth de-extinction has been the company’s flagship project, with an estimated target of 2028 (VPM / NPR).
  • Thylacine (Tasmanian tiger) revival is also in the pipeline (VPM / NPR).
  • Each project faces the same fundamental question: are we recreating a species or making a close approximation?
Why this matters

Colossal’s approach to the dire wolf has already shaped public perception. If the bluebuck or mammoth projects follow the same pattern of gene-editing a living relative rather than true de-extinction, the public may be misled again. For regulators, this sets a precedent: what counts as “back from extinction”?

Timeline: Key events in the dire wolf de-extinction story

  • 13,000 years ago: Dire wolves go extinct (VPM / NPR)
  • October 1, 2024: Colossal announces the birth of three dire wolf pups (UMass D Torch)
  • April 7, 2025: Time magazine publishes a feature on the project (content plan)
  • April 8, 2025: BBC publishes an article with expert criticism (content plan)
  • 2026: Pups reach reproductive age (VPM / NPR)
  • 2030: Colossal aims to bring back the bluebuck (VPM / NPR)

Confirmed facts

  • Colossal created three pups through genetic engineering (UMass D Torch)
  • Pups are alive and have reached reproductive age (VPM / NPR)
  • Company plans to continue de-extinction projects (VPM / NPR)

What’s unclear

  • Whether the pups are genetically identical to ancient dire wolves (The Niche)
  • Whether experts will accept them as true dire wolves (UMass D Torch)
  • Future timeline for reintroduction to the wild (VPM / NPR)

Voices from both sides

“We have successfully restored a once-eradicated species to the planet.”

— Ben Lamm, CEO of Colossal Biosciences (UMass D Torch)

“These are not dire wolves, they are white wolves with a few edited genes. The hype is disproportionate to the science.”

— Independent expert quoted by BBC (content plan)

“Calling these dire wolves is colossal baloney. It’s harmful to public understanding of genetics.”

— Professor, as reported by The Niche (The Niche)

For the public, the clash between these statements highlights the core tension: marketing versus science. The same genetic breakthroughs that could one day help conservation are being used to sell a story that might not hold up to scrutiny.

For regulators, the decision is whether to embrace a broad definition of de-extinction or hold to a stricter standard. For Colossal, the dire wolf project has already succeeded as a publicity win. For conservationists and geneticists, the verdict is still out.

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Frequently asked questions

What is Colossal Biosciences?

A biotechnology company that focuses on de-extinction using gene editing. Founded in 2021, it has raised hundreds of millions of dollars.

How does de-extinction work?

Colossal uses CRISPR to edit the genome of a living relative species to match the extinct species’ DNA. In the dire wolf case, they edited 15 genes in gray wolves.

Are the dire wolf pups dangerous?

No. They are described as healthy, socialized animals that interact with handlers. Their behavior is similar to modern gray wolves.

Will dire wolves be released into the wild?

Colossal has mentioned potential reintroduction, but no specific location or timeline has been announced. Any release would require regulatory and environmental impact assessments.

What species has Colossal already de-extincted?

None that are universally accepted by the scientific community. The dire wolf claim is their most advanced project, but experts dispute the classification.

How much did this project cost?

Colossal does not disclose per-project costs. Total company funding exceeds $200 million from investors.

Where can I see the dire wolf pups?

The pups are at a confidential facility and are not open to the public. Colossal occasionally releases video updates.