The chickens hatched. They were alive and healthy, born not from a mother bird but from a machine.
In a laboratory that dreams in geological time, scientists at Colossal Biosciences have coaxed life from a machine-printed shell — a lattice of plastic and membrane standing in for something evolution spent millions of years perfecting. Fertilized chicken embryos transferred into these 3D-printed artificial eggs hatched successfully, solving a decades-old oxygen problem that had defeated every prior attempt at surrogate incubation. The achievement sits at the intersection of hubris and hope: a company that speaks openly of resurrecting the dodo and the moa has, for now, simply given a chicken a new kind of home — and in doing so, may have quietly handed conservationists a tool that could keep living species from following extinct ones into silence.
- A 3D-printed lattice coated with a semi-permeable membrane has done what decades of artificial egg experiments could not — let oxygen flow naturally to a developing embryo, and the chickens inside hatched alive.
- Every previous surrogate shell since 1998 had the same fatal flaw: embryos slowly suffocated, and hand-pumped oxygen interventions failed often enough to make the whole enterprise a study in repeated loss.
- Colossal Biosciences is pointing this technology at the dodo and the moa, arguing that eggs can be printed at any scale — large enough, in theory, to cradle a creature that has not existed for centuries.
- Geneticists remain unconvinced: the company's prior claim of reviving the dire wolf was widely disputed, and reconstructing a viable dodo genome is a problem no one has solved, printed egg or not.
- The more grounded promise lands closer to the present — endangered bird conservation programs could use these eggs to breed fragile species without DNA editing or the sacrifice of multiple clutches to support a single chick.
- De-extinction is a headline; preventing extinction is the work, and this technology may matter most not in the deep past it promises to recover, but in the living future it could help protect.
Colossal Biosciences, the company long associated with woolly mammoth revival, has developed an artificial egg system built around a 3D-printed lattice coated with a semi-permeable membrane. The membrane's function is elegantly simple: it admits oxygen while retaining moisture, mimicking the behavior of a real shell. When researchers transferred fertilized chicken egg contents into these printed structures, the embryos developed and hatched — healthy chicks born not from a bird but from a printer.
The achievement matters because every previous artificial egg attempt, dating back to 1998, shared the same fatal flaw. Without sufficient oxygen, embryos suffocated. Researchers tried pumping in supplemental gas by hand, but the results were poor and stillbirth rates remained high. The printed membrane solves this passively, without intervention.
Colossal has larger ambitions in view. The company wants to use the technology to resurrect the dodo and the moa, a giant flightless bird from New Zealand. Because the eggs can be printed at any size, even a much larger resurrected animal could theoretically develop inside one. The company concedes the result might not be a perfect genetic replica — but close enough, they argue, to count.
Skepticism is reasonable here. Colossal previously claimed to have revived the dire wolf, a claim geneticists quickly challenged. The deeper science — actually reconstructing a viable dodo or moa genome — remains unsolved, and many researchers doubt a resurrected embryo could survive in a conventional egg's yolk. The printed egg could address that too, by pooling yolk from multiple eggs into a single large artificial chamber.
The more immediate application may prove more consequential. Endangered bird species could be bred using these shells without DNA editing or the sacrifice of multiple eggs to sustain one developing chick. For conservation programs already stretched thin, that simplification could be transformative. De-extinction remains a distant and contested horizon. Keeping living species alive is the urgent work — and on that front, the printed egg may already have something real to offer.
Colossal Biosciences, the company that has spent years chasing the dream of bringing back the woolly mammoth, has now turned its attention to a more immediate problem: how to grow animals outside the body. The answer, it turns out, may be sitting in a 3D printer.
The company has developed what it calls an artificial egg system—a lattice structure printed in three dimensions and coated with a semi-permeable membrane. The membrane does something deceptively simple: it lets oxygen in while keeping moisture out. To prove the concept works, researchers transferred the contents of fertilized chicken eggs into these printed shells. The chickens hatched. They were alive and healthy, born not from a mother bird but from a machine.
This is not the first time someone has tried to grow an embryo in an artificial egg. Scientists have been experimenting with surrogate shells since 1998. But every previous attempt had the same fatal flaw: not enough oxygen. Embryos developing inside would suffocate slowly. Researchers had to pump in supplemental gas by hand, a process that worked poorly and often ended in stillbirth. The printed eggs solve this by allowing oxygen to flow naturally through the membrane, mimicking what happens inside a real shell.
Colossal Biosciences is not shy about its larger ambitions. The company wants to use this technology to resurrect extinct species—specifically the dodo and the moa, a massive flightless bird from New Zealand. The eggs can be printed in any size, which means a resurrected creature, even one much larger than a chicken, could theoretically develop inside. The company acknowledges that what emerges might not be a perfect replica of the original animal, but something close enough to matter.
The skepticism is warranted. Colossal Biosciences has made bold claims before. The company announced it had revived the dire wolf, a claim that geneticists quickly dismantled. The company's track record on de-extinction is thin, and the science of actually creating a viable dodo or moa genome remains unsolved. Even if researchers could crack that problem, many scientists doubt a resurrected embryo could survive in the yolk of a conventional egg. The printed eggs could solve that too—by pooling yolk from multiple eggs into one large artificial chamber.
But the more practical application may be closer at hand. Endangered bird species around the world face extinction. Using these printed eggs, conservationists could breed birds without having to edit their DNA or sacrifice multiple eggs to support a single developing chick. The technology sidesteps the ethical and practical problems that have long complicated breeding programs. For species on the edge of disappearing, that alone could be transformative. De-extinction remains speculative. Conservation is urgent and real.
Notable Quotes
The company acknowledges that what emerges might not be a perfect replica of the original animal, but something close enough to matter.— Colossal Biosciences, on de-extinction goals
The Hearth Conversation Another angle on the story
Why does the oxygen problem matter so much? Couldn't researchers just keep pumping in gas?
They tried that for decades. The supplemental oxygen helped, but it wasn't natural. Embryos still died at high rates. The printed membrane lets oxygen diffuse the way it does through a real eggshell—slowly, steadily, without intervention. That changes everything.
So this is really about solving a problem that's been around since 1998?
Yes, but it took a different technology to see it. 3D printing gave them the precision to create a membrane that works like biology, not like a machine.
The company wants to resurrect the dodo. Do you think that's actually possible?
Honestly, no one knows yet. The egg is one piece. You'd still need the genome, the ability to edit it correctly, and a way to implant it. But the egg removes one major barrier that used to seem impossible.
What about the dire wolf claim? Doesn't that make you skeptical?
It should. The company oversold that. But this time they have something tangible—chickens that hatched. That's not hype. That's a working prototype.
So what's the real use case?
Saving birds that are alive right now. Endangered species breeding programs. That's where this technology will matter first, before anyone even thinks about extinct animals.