
Colossal Biosciences just announced a milestone. The Dallas biotech firm hatched 26 live chickens from a 3D-printed lattice that mimics an eggshell. No hen. No natural shell for most of development. The chicks now range from days to months old. They look ordinary. Yet this step feeds directly into the company’s larger ambition: bringing back extinct giants like the South Island moa.
Ben Lamm, Colossal’s CEO, framed the work as practical engineering. “We wanted to build something that nature has done a pretty good job of developing and make it better and scalable and even more efficient,” he said, according to Fortune. The firm had already produced mice with mammoth-like hair and wolf pups modeled on dire wolves. Now it turns to birds. The moa, a flightless New Zealand species that stood over 3 meters tall, laid eggs roughly 80 times the volume of a chicken’s. No living bird could incubate one. An artificial system might.
The Technical Claim
Colossal’s platform uses a printed lattice structure with a silicone membrane. Scientists transferred contents from fertilized chicken eggs into these constructs, added calcium, and incubated them. Real-time imaging tracked embryo growth. The system supplies oxygen without supplemental gas in later stages. Twenty-six chicks emerged healthy. The company calls it the first full end-to-end success from a fully artificial construct, per its press release.
But independent researchers push back. Vincent Lynch, an evolutionary biologist at the University at Buffalo, examined the details. “They might be able to use this technology to help them make a genetically modified bird, but that’s just a genetically modified bird. It’s not a moa,” he told the Associated Press. He added a sharper distinction: “That’s not an artificial egg because you’ve poured in all the other parts that make it an egg. It’s an artificial eggshell.”
Lynch’s critique lands on substance. Natural eggs contain temporary organs that nourish the embryo, manage waste and stabilize development. Colossal’s version supplies the shell and gas exchange but relies on the original egg’s internal material. Earlier experiments decades ago used plastic films or sacks to create transparent shells for developmental studies. Nicola Hemmings, who researches bird reproductive biology at the University of Sheffield, noted the precedent. “Producing a chick from an artificial vessel is not necessarily new,” she said.
Yet Colossal insists the advance matters. The lattice scales. It avoids the physical limits of surrogate birds. For the dodo or moa, whose genomes the company has sequenced and compared to living relatives, this platform could one day support edited primordial germ cells grown in chicken hosts before transfer. Recent coverage in Nature captured the caution from the field. Researchers there urged restraint even as they acknowledged potential conservation uses for endangered species.
Bioethicist Arthur Caplan at New York University’s Grossman School of Medicine raised a different question. “The big challenge is, what environment is this animal going to live in?” The moa vanished centuries ago. New Zealand’s forests have changed. Predators, plants and climate differ. Releasing approximations of extinct megafauna carries ecological risk no lab test can fully predict.
Hemmings offered a blunter priority. “My personal interests lie more in preserving what we’ve got than trying to bring back what is already gone.” Her stance echoes a divide in conservation biology. Some see de-extinction as distraction. Others view the underlying tools—gene editing, synthetic gestation, high-fidelity genomes—as applicable to species still hanging on. Ben Novak at Revive & Restore, a nonprofit focused on passenger pigeon revival, told Nature the artificial egg could find immediate takers in zoos and breeding programs.
Colossal has moved fast. It raised hundreds of millions in venture capital. Its dire wolf pups, announced in 2025, drew both wonder and accusations of overstatement; critics noted the animals were genetically edited gray wolves, not true clones of the extinct Pleistocene predator. The chick announcement follows the same pattern. Public excitement spikes. Scientific skepticism follows.
And the skepticism has merit. Full de-extinction demands more than a bigger printed shell. It requires accurate reconstruction of ancient DNA, functional expression of extinct traits, viable germline transmission and, eventually, self-sustaining populations. Each layer compounds technical difficulty and ethical weight. So far Colossal has demonstrated edited mammals and now scalable avian incubation. Impressive. Not resurrection.
Still, the engineering deserves credit. Real-time imaging inside an artificial construct offers data hard to gather in opaque natural eggs. Scalability could lower costs for conservation breeding of rare cranes or parrots whose eggs suffer high mortality. If the platform works at moa scale without supplemental oxygen, as claimed, it removes one physical barrier that once seemed absolute.
Recent reporting adds texture. Gizmodo described the shell as titanium and bioengineered silicone in some components. Dallas Innovates highlighted the company’s local roots and the shell-less incubation platform’s potential for giant bird revival. NPR explored the dodo and moa targets directly, noting Colossal already prepares larger artificial eggs for those species.
Public reaction on X mixed awe with Jurassic Park jokes. One post asked whether society stands “on the verge of real Jurassic Park-style de-extinction.” Another summarized the 26 chicks as proof of concept but reminded followers that true moa revival remains distant. The conversation reveals the tension. Audiences love the spectacle. Experts fixate on the gaps.
Colossal’s leadership shows no signs of slowing. Lamm has said the firm did not want to wait until moa-ready before tackling birth engineering. That choice makes sense from a product development view. Solve the small problems first. Iterate. Scale. Yet it invites criticism that announcements outpace substantive leaps toward genuine revival.
The chicks themselves offer the clearest data point. They hatched. They live. The system functions. Whether that system can ever produce a functional proxy for a 3-meter flightless bird with an entirely different developmental timeline is another matter. Scientists will watch the next iterations closely. So will investors. And so will anyone who remembers the original warning from a 1993 film: life finds a way. The question now is whether humanity should help it do so.
One fact remains undisputed. The technology Colossal demonstrated this week did not exist in public view a year ago. Its refinement will shape debates over conservation priorities, synthetic biology limits and the very definition of extinction for years ahead. Short of creating a moa, the firm has already altered the conversation.
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