Inside Colossal Biosciences' 3D-Printed Artificial Eggshell: A New Frontier in Avian De-Extinction and Conservation

Colossal Biosciences, a biotech company known for its ambitious de-extinction projects, has recently unveiled a breakthrough in avian reproductive technology: a fully artificial eggshell made via 3D printing. This innovation could transform how scientists nurture endangered birds—and even resurrect long-lost species like the dodo and the giant moa. Below, we answer key questions about this fascinating development, from how the artificial shell works to the controversy surrounding the company's claims.

What exactly is Colossal's artificial eggshell?

It's a 3D-printed, oval-shaped lattice coated on the inside with a special silicone-based membrane. This membrane mimics the function of a natural eggshell by allowing oxygen to pass through, enabling embryonic development. The shell has a transparent window on top so researchers can observe the growing chick. In essence, it's an 'artificial eggshell' rather than a fully artificial egg, since it replaces only the shell—not the yolk or albumen. The company has even created a prototype large enough to accommodate the massive eggs of the extinct giant moa, playfully nicknamed the 'salad spinner' by staff.

Inside Colossal Biosciences' 3D-Printed Artificial Eggshell: A New Frontier in Avian De-Extinction and Conservation — Source: www.technologyreview.com

How are chicks transferred to the artificial shell?

The process begins with recently laid chicken eggs. Scientists carefully crack open the natural shell and pour the entire contents—yolk, albumen, and developing embryo—into the 3D-printed cup. Once inside, the embryo continues to grow normally under controlled conditions. The silicone membrane provides gas exchange similar to a real eggshell, while the rigid lattice protects the delicate structure. This method allows researchers to monitor development more closely than with traditional eggs, and it can be scaled for conservation or de-extinction purposes. The company's chief biology officer, Andrew Pask, described the moment of seeing chicks moving inside the artificial shells as 'absolutely mind-blowing.'

What is the main purpose of this artificial eggshell?

Colossal Biosciences aims to use the artificial eggshell for two key goals: conserving at-risk bird species and resurrecting extinct ones. By providing a controllable, sterile environment, the technology could help breed birds that struggle to reproduce in captivity or face egg predation in the wild. More famously, it's a critical tool for Colossal's de-extinction projects, including the dodo and the giant moa. The moa, a flightless bird that stood up to 12 feet tall, laid eggs larger than any living bird—over four liters in volume. Since no modern bird can naturally incubate such a large egg, the 3D-printed shell offers a way to nurture a re-created moa embryo should scientists ever successfully edit the genome of a related bird.

What challenges remain before Colossal can re-create the moa?

Re-creating the giant moa is still a distant goal. Scientists first need to sequence and analyze DNA from ancient moa bones. Then they must introduce thousands of precise genetic changes into the genome of a modern bird—likely an emu or ostrich, which are close relatives. This gene-editing step remains technically difficult, even with tools like CRISPR. Only after that could the artificial eggshell come into play, providing a suitable incubation environment for the modified embryo. Colossal acknowledges it's not close to achieving this, but the artificial shell removes one major physical barrier: the lack of an egg large enough and capable of supporting such a huge chick.

Why are some scientists critical of Colossal's artificial egg announcement?

While the artificial eggshell is a genuine scientific advance, critics argue that Colossal often exaggerates its achievements to generate hype. The company released a dramatic YouTube video proclaiming it had solved the 'impossible question of which came first, the chicken or the egg'—a statement many researchers consider overblown. This follows a pattern: last year, Colossal claimed it had re-created the extinct dire wolf, a claim widely rejected by experts because the animal produced wasn't a true genetic replica. Skeptics worry that such grandstanding undermines public understanding of science and distracts from the real, incremental progress being made. Nonetheless, the artificial eggshell technology itself is a legitimate tool that could benefit avian conservation, regardless of the company's marketing approach.

How might this technology be used beyond de-extinction?

Beyond resurrecting extinct birds, the artificial eggshell has immediate applications in conservation. Many bird species are critically endangered, and their eggs are vulnerable to environmental threats, predators, or poor incubation in captivity. The 3D-printed shell allows researchers to remove an egg from the wild or a breeding program and raise the chick in a controlled, sterile environment—complete with real-time observation. This could boost hatching success rates for species like the California condor or the kiwi. Additionally, the same silicone membrane and lattice design could be adapted for other egg-laying animals or even for growing embryos of other species in a placenta-like artificial womb. Colossal's ultimate goal is to make the technology scalable and controllable, opening the door to 'animal husbandry' for conservation on a large scale.