Colossal Biosciences Artificial Egg: 26 Chicks Hatched
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Colossal Biosciences Artificial Egg Hatches 26 Chickens in Breakthrough Step Toward Dodo and Moa De-Extinction
BY Colossal Biosciences
The Colossal Biosciences artificial egg — a silicone-membrane synthetic shell system — successfully hatched 26 healthy chickens, the Dallas-based de-extinction company announced on May 19, 2026. Colossal Biosciences describes the breakthrough as a foundational step toward its goal of resurrecting extinct bird species, including New Zealand’s South Island giant moa and Mauritius’s dodo.
What the Colossal Artificial Egg System Is
The Colossal artificial egg is a two-component system: a semi-permeable silicone-based membrane housed inside a rigid hexagonal support cup. The membrane is engineered to replicate the gas-exchange function of a natural eggshell — allowing oxygen to pass through while retaining moisture and blocking contaminants. According to Colossal Chief Biology Officer Andrew Pask, the membrane enables gas exchange at a rate comparable to a biological shell.
"It’s a really specialized very thin membrane that enables there to be really effective gas exchange, which is what the eggshell is unbelievably engineered for." — Andrew Pask, Chief Biology Officer, Colossal Biosciences
The system also incorporates a clear window at the top of the artificial egg, allowing scientists to observe embryo development directly without disrupting the environment inside. The design is variable in size — in theory scalable from hummingbird-egg dimensions down to the soccer-ball-sized eggs of the South Island giant moa, which once stood nearly 12 feet tall.
Why Hatching Birds Without Natural Shells Has Been Difficult
Prior shell-free hatching systems have faced a consistent barrier: most require large volumes of supplemental concentrated oxygen during later development stages, which risks damaging DNA in the developing embryo. Success rates using plastic cups, saran wrap, and other artificial containers have historically been low, according to Mike McGrew, an embryologist at the Roslin Institute and a scientific advisor on avian stem cells to Colossal.
System<br>Approach<br>Key Limitation
Surrogate eggshell (Roslin, 1988)<br>Embryo grown in lab culture, transferred to donor shell<br>Requires sourcing intact donor shells; low scalability
Plastic cup / saran wrap systems<br>Shell-free containers with supplemental oxygen<br>Low hatch rates; concentrated oxygen risks embryo DNA damage
Colossal artificial egg (2026)<br>Silicone-membrane cup with passive gas exchange<br>Hatch rate not publicly released; requires real hen for fertilization and laying
The Colossal system addresses the oxygen problem through passive diffusion via the silicone membrane rather than active supplementation. The Roslin Institute’s precedent dates to 1988, when geneticist Margaret Perry first hatched chicks from embryos grown in laboratory cultures and transferred to surrogate donor shells — a method that has since been iterated upon but never fully solved for scalability or species flexibility.
How the Artificial Egg Fits Into Colossal’s De-Extinction Workflow
The Colossal artificial egg does not replace the biological processes that precede egg-laying — it intervenes after them. In the current workflow, scientists examine eggs laid by real hens within 24 to 48 hours of laying, select viable candidates, and transfer the contents — minus the shell — into the artificial egg structure. All upstream biology, from fertilization through laying, still occurs in a living bird.
For de-extinction applications, the artificial egg is intended as a later-stage incubation vessel, not the point of genetic intervention. To produce a bird resembling the dodo or giant moa, Colossal’s scientists would need to introduce species-specific genetic edits at a far earlier cellular stage. As Hans Cheng, a...