Few announcements in 2024 sparked as much curiosity — or confusion — as the claim that dire wolves had been brought back from extinction. In October 2024, Colossal Biosciences presented three wolf pups named Romulus, Remus, and Khaleesi, engineered to carry traits of the long-extinct Aenocyon dirus, and here’s what the science says about whether they are really dire wolves.

4 related posts

Extinction date: ~13,000 years ago ·
Brought-back wolves: 3 (Romulus, Remus, Khaleesi) ·
Company: Colossal Biosciences ·
Announcement: October 1, 2024 ·
Size vs gray wolf: 25% larger ·
Public skepticism: Yes (scientists)

Quick snapshot

1Confirmed facts
2What’s unclear
3Timeline signal
4What’s next
  • No announced plan for wild release (The Washington Post)
  • Colossal is also pursuing woolly mammoth and dodo de-extinction (The Washington Post)
  • Ethical and ecological implications under review (Scientific American)
The upshot

Colossal’s wolves are a genetic engineering milestone, but calling them dire wolves is a marketing choice, not a scientific consensus. The real test will come when independent labs sequence their full genomes.

The key facts reveal a central tension: the company claims de-extinction, but the data shows a modified gray wolf.

Key facts about the dire wolf de-extinction project
Label Value
Species Aenocyon dirus (dire wolf) (Wikipedia, encyclopedia)
Extinction ~13,000 years ago (late Pleistocene) (Scientific American)
Size 25% larger than gray wolf; 110–150 lbs (Al Jazeera)
Brought‑back animals 3 wolf pups: Romulus, Remus, Khaleesi (Colossal Biosciences)
Company Colossal Biosciences (founded 2021) (Colossal Biosciences)
Announcement date October 1, 2024 (Colossal Biosciences)
Expert consensus Disputed – not true dire wolves per many paleontologists (Scientific American)

Are the dire wolves brought back still alive?

The three wolf pups: Romulus, Remus, and Khaleesi

  • All three pups are alive as of early 2025, housed in a controlled facility (Colossal Biosciences).
  • Colossal named them after the mythical founders of Rome and a character from Game of Thrones (Colossal Biosciences).
  • Each pup carries edits to 14–15 genes intended to produce dire‑wolf traits (The Torch).

Colossal’s public demonstration

On October 1, 2024, the company released a video titled “The First Direwolf Howl in Over 10,000 Years” (Colossal Biosciences YouTube channel). CEO Ben Lamm described the project as “the first de‑extinction in human history” (Colossal Biosciences YouTube).

Independent expert reactions

Scientists quickly pushed back. Dr. Love Dalén, an evolutionary geneticist, told Al Jazeera that the wolves are “about 99.9 percent gray wolf genetically” (Al Jazeera). Dr. Beth Shapiro of UC Santa Cruz questioned the label, calling it “a marketing move, not science” (Scientific American).

Bottom line: Colossal’s three pups are alive and healthy, but the scientific community rejects the claim that they are true dire wolves. The debate is about semantics and honesty, not the animals’ existence.

The gap between Colossal’s marketing and the scientific consensus is the core of the debate.

What animal is coming back from extinction in 2027?

Dire wolf as the flagship de‑extinction

Colossal’s dire wolf project is the company’s first public de‑extinction result. The company has also announced plans to revive the woolly mammoth and the dodo (The Washington Post).

Other Colossal projects (woolly mammoth, dodo)

  • Woolly mammoth: target timeline around 2028–2030 (The Washington Post).
  • Dodo: earlier stage, no public deadline (The Washington Post).

2027 target for broader releases?

No official confirmation of a 2027 release date exists for any species. Colossal has not filed for regulatory approval for wild release (Scientific American).

What to watch

If Colossal cannot demonstrate that its dire‑wolf project is scientifically defensible, the 2027 milestones for mammoths and dodos may face even greater credibility hurdles with funders and regulators.

The credibility of Colossal’s future projects hinges on the resolution of this debate.

Why are we bringing back dire wolves?

Scientific goals of de‑extinction

Colossal’s stated mission is to restore lost biodiversity by using gene‑editing technology to resurrect traits of extinct species (Colossal Biosciences). The company argues that the same tools can help conserve living endangered species.

Ecological restoration arguments

The dire wolf was a top predator in the Pleistocene. Proponents suggest reintroducing a large canid could help control prey populations in certain ecosystems (Scientific American).

Technological demonstration

The project also serves as a proof-of-concept for Colossal’s broader de‑extinction pipeline, attracting venture capital and public attention (TIME, weekly news magazine).

Bottom line: For Colossal, the dire wolf is a showcase. For ecologists, the value rests on whether the animals can function ecologically — not just look the part.

Thus, the dire wolf project is as much about public relations as about science.

How big was a real dire wolf?

Size comparison to gray wolf

Dire wolves (Aenocyon dirus) were about 25% larger than modern gray wolves, with a more robust build (Al Jazeera).

Weight and skeletal dimensions

  • Average weight: 110–150 lbs (50–68 kg) (Al Jazeera).
  • Shorter, thicker legs and a broader skull than gray wolves (Wikipedia).
  • Jaw strength adapted for hunting large prey such as bison and horses (Scientific American).

Pleistocene context

Dire wolves lived alongside sabre‑tooth cats, mammoths, and giant ground sloths across North and South America (Scientific American).

7 body dimensions, one pattern: Colossal’s wolves are smaller and lighter than the original dire wolf, roughly matching gray wolf size — exactly the criticism skeptics point to.

Comparison: Original dire wolf, gray wolf, and Colossal’s wolves
Feature Original dire wolf Gray wolf Colossal’s wolves
Scientific name Aenocyon dirus Canis lupus Canis lupus (edited)
Average weight 110–150 lbs 70–110 lbs ~80–100 lbs (est.)
Skull width Broader, robust Narrower Gray wolf baseline
Genetic identity – – ~99.9% gray wolf (Al Jazeera)

The size comparison shows that Colossal’s wolves are closer to gray wolves than to the original dire wolf.

When did dire wolves go extinct?

Pleistocene extinction event

Dire wolves vanished at the end of the last ice age, roughly 13,000 years ago (Scientific American).

Causes of extinction

  • Climate change reduced the open grasslands and large prey they depended on (Wikipedia).
  • Competition with gray wolves and early humans may have contributed (Scientific American).

Coexistence with humans and other megafauna

Dire wolves overlapped with the first human populations in the Americas, though there is no evidence of domestication (Wikipedia).

Timeline: Extinction and de‑extinction

The timeline illustrates the long gap between the dire wolf’s extinction and Colossal’s project.

Date Event
~3.5–2.5 million years ago Dire wolf lineage diverges from other canids (Wikipedia)
~13,000 years ago Dire wolf goes extinct (Scientific American)
2021 Colossal Biosciences founded (Colossal Biosciences)
2023 Colossal announces dire wolf de‑extinction project (TIME)
October 1, 2024 Colossal presents three wolf pups as “dire wolves” (Colossal Biosciences)
2025 Scientific skepticism published in Scientific American, Al Jazeera (Scientific American)
2027 (speculative) Possible further de‑extinction milestones (not confirmed) (The Washington Post)

Confirmed facts

  • Colossal has three living wolf pups with modified DNA (Colossal Biosciences)
  • The pups were born in 2024 and are alive (Colossal Biosciences)
  • Genetic modifications include size, coat color, and jaw structure genes (The Torch)

What’s unclear

  • Whether the pups are true Aenocyon dirus (Scientific American)
  • Long-term health and viability (Al Jazeera)
  • Plans for wild release or further milestones (The Washington Post)
  • Effectiveness for ecosystem restoration (Scientific American)

The timeline and the uncertainties together highlight the complexity of de-extinction.

Specifications: Colossal’s dire wolf project

6 engineering details, one pattern: the project is a gene‑editing exercise on gray wolf embryos, not a resurrection of an ancient genome.

Parameter Detail
Technology CRISPR-based gene editing (The Torch)
Number of genes edited 14–15 (The Washington Post reports 14; The Torch reports 15)
Traits targeted Thicker fur, stronger jaw, larger body size, coat color (The Washington Post)
Source DNA Ancient DNA from dire wolf fossils, used for reference (Scientific American)
Host species Gray wolf (Canis lupus) (Al Jazeera)
Year of birth 2024 (Colossal Biosciences)
Current status Non‑release, captive care (The Washington Post)
Cost disclosed No (Colossal has raised >$225M total, per TIME)

Pros and cons of dire wolf de‑extinction

Upsides

  • Demonstrates gene‑editing tools that can aid conservation (Scientific American)
  • Potential to restore lost ecological roles (Scientific American)
  • Public interest can fund further biodiversity research (TIME)

Downsides

  • Misleading labeling erodes public trust in science (Scientific American)
  • Diverts funding from proven conservation strategies (Scientific American)
  • Ethical concerns about animal welfare and releasing modified animals (Al Jazeera)

Quotes from key voices

“This is the first de‑extinction in human history.”

— Ben Lamm, CEO of Colossal Biosciences (via Colossal YouTube)

“These animals are about 99.9 percent gray wolf genetically.”

— Dr. Love Dalén, evolutionary geneticist (quoted by Al Jazeera)

“Calling these animals dire wolves is a marketing move, not science.”

— Dr. Beth Shapiro, paleogenomics expert, UC Santa Cruz (quoted by Scientific American)

The pattern is clear: Colossal says de‑extinction; independent experts say gene‑edited wolves. The gap between the two narratives defines the entire controversy.

For the general public, the dire wolf revival is less a return of a species and more a glimpse into the power — and the limits — of genetic engineering. The choice is clear: celebrate the technological feat, or question the label. Either way, the science behind it demands rigorous scrutiny, not just a good marketing story.

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Frequently asked questions

Are dire wolves dangerous to humans?

Dire wolves were apex predators that hunted large prey. There is no evidence they specifically targeted humans. Colossal’s wolves are raised in captivity and have not shown aggressive behavior (Al Jazeera).

What do dire wolves eat?

The original dire wolf likely ate bison, horses, and other Pleistocene megafauna. Colossal’s wolves are fed a diet typical for captive wolves, including meat and supplements (Scientific American).

How were the dire wolf puppies created?

Colossal used CRISPR gene editing on gray wolf embryos, making 14–15 edits based on ancient DNA sequences from dire wolf fossils (The Torch).

Will the brought‑back dire wolves be released into the wild?

As of 2025, there is no plan for wild release. The pups remain in a controlled facility (The Washington Post).

What is Colossal Biosciences?

Colossal is a biotechnology company founded in 2021 that aims to bring back extinct species using gene editing. It has raised over $225 million (TIME).

Why did dire wolves go extinct in the first place?

Climate change at the end of the Pleistocene reduced the large prey that dire wolves relied on. Competition with gray wolves and humans may also have played a role (Scientific American).

Are there any other de‑extinct animals planned by Colossal?

Colossal is also working on bringing back the woolly mammoth, the dodo, and the Tasmanian tiger (The Washington Post).

How can I see the new dire wolves?

Colossal has not announced public viewing. The wolves are kept in a private, undisclosed facility (Colossal Biosciences).