Extinction need not be permanent
Durante más de tres siglos, el dodo ha sido el emblema más reconocible de lo que la humanidad puede borrar del mundo. Ahora, la empresa californiana Colossal Biosciences anuncia que ha ensamblado el genoma completo del ave y ha comenzado a desarrollar embriones en laboratorio, utilizando al palomo de las Nicobar —su pariente vivo más cercano— como base genética para reintroducir rasgos extintos mediante edición génica avanzada. Lo que está en juego no es solo el regreso de un pájaro: es la pregunta de si la extinción, ese umbral que creíamos definitivo, puede dejar de serlo.
- El dodo lleva más de trescientos años extinto, pero por primera vez su regreso ha dejado de ser una fantasía para convertirse en un proyecto científico con embriones reales en desarrollo.
- El proceso exige recuperar ADN utilizable de especímenes museísticos centenarios, reconstruir un genoma funcional y reescribir el código genético de una especie viva para que exprese rasgos de otra desaparecida.
- Cada etapa presenta obstáculos formidables: sistemas de gestación controlada, simulaciones biológicas y pruebas de viabilidad que podrían extenderse durante años antes de producir un ejemplar vivo.
- Más allá del dodo, las técnicas desarrolladas podrían aplicarse a otras especies al borde de la extinción, ofreciendo una herramienta sin precedentes frente al colapso global de la biodiversidad.
- Aún sin un embrión vivo ni un polluelo, el proyecto avanza entre incertidumbres científicas y preguntas sin respuesta sobre dónde vivirían estas aves y cómo encajarían en ecosistemas que han cambiado por completo.
El dodo desapareció de la isla de Mauricio hacia la década de 1680, cazado hasta la extinción por marineros y colonos europeos que encontraron en su incapacidad de volar y su falta de depredadores naturales una presa fácil. Durante más de tres siglos, se convirtió en el símbolo más reconocible de lo que el ser humano puede destruir. Ahora, la empresa californiana Colossal Biosciences afirma haber dado un paso sin precedentes hacia su resurrección.
Los investigadores han ensamblado un genoma completo del dodo a partir de restos conservados en museos y colecciones, y han comenzado a desarrollar embriones en laboratorio usando al palomo de las Nicobar —su pariente vivo más próximo— como base biológica. La idea es introducir rasgos específicos del dodo en estos embriones mediante edición génica avanzada, reescribiendo el código de una especie para resucitar otra. Según la compañía, los primeros embriones viables podrían desarrollarse en los próximos años.
La ciencia involucrada es tan intrincada como exigente. Recuperar ADN funcional de especímenes centenarios, reconstruir un genoma completo y transformar células vivas en algo que no ha existido desde el siglo XVII son desafíos que hasta hace poco parecían insuperables. A eso se suman los sistemas de gestación controlada, las pruebas de laboratorio y las simulaciones biológicas necesarias para garantizar que cualquier dodo que llegue al mundo sea realmente viable.
Lo que convierte este momento en algo más que una curiosidad científica es su alcance potencial. Las técnicas desarrolladas para el dodo podrían aplicarse a otras especies al borde de la extinción, ofreciendo una herramienta nueva en un mundo que pierde biodiversidad a un ritmo alarmante. El dodo es, al mismo tiempo, el símbolo y el caso de prueba: lo que la negligencia humana puede borrar, y lo que el ingenio humano podría restaurar.
Por ahora, el ave existe solo en secuencias genéticas y células editadas. No hay aún un embrión vivo, y el horizonte se mide en años. Persisten además preguntas sin respuesta sobre dónde vivirían estas aves y cómo encajarían en ecosistemas que han cambiado radicalmente desde su extinción. Pero por primera vez en trescientos años, la posibilidad de que el dodo vuelva a caminar sobre la tierra ha dejado de ser puramente teórica.
The dodo has been dead for more than three centuries. The flightless bird vanished from the island of Mauritius around the 1680s, becoming the world's most recognizable symbol of extinction—a cautionary tale carved into the cultural memory of what humans can destroy. Now, a California-based company called Colossal Biosciences says it has moved closer to bringing the bird back to life than anyone thought possible.
The announcement arrived with genuine scientific weight. Researchers at the company have assembled a complete genetic blueprint of the dodo by working from preserved remains held in museums and collections. They have begun developing embryos in the laboratory, using Nicobar pigeons—the dodo's closest living relatives—as the biological foundation. The plan is to introduce dodo-specific traits into these pigeon embryos through advanced genetic editing, essentially rewriting the code of one species to resurrect another. According to the company, the first viable embryos could develop within the next several years.
The science is intricate and unforgiving. Researchers must recover usable DNA from centuries-old specimens, piece together a functional genome, and then use cutting-edge gene-editing tools to transform living cells into something that has not existed since the 17th century. But the technical hurdles are only part of the challenge. The team must also develop controlled gestation systems, run countless laboratory tests, and conduct biological simulations to ensure that any dodo brought into the world would actually be viable—capable of surviving, developing normally, and potentially reproducing.
What makes this moment significant is not just the dodo itself. Scientists involved in the project emphasize that the techniques being developed here could be applied to other species teetering on the edge of extinction. The world is losing biodiversity at an alarming rate, and traditional conservation methods—habitat protection, breeding programs, legal protections—have limits. Genetic resurrection offers a new tool, one that could theoretically rescue species that have already vanished or are so few in number that their genetic diversity has collapsed beyond recovery.
The dodo, in this sense, is both the symbol and the test case. It represents what human carelessness can erase, but it also represents what human ingenuity might restore. The bird was hunted to extinction by European sailors and settlers who found it easy prey; its flightlessness and lack of natural predators made it defenseless. Bringing it back would be a kind of reckoning—not an erasure of that historical harm, but an acknowledgment that the tools now exist to reverse at least some of what was lost.
Still, the work ahead is substantial. Every stage of the process presents obstacles that, until recently, seemed insurmountable. The company has not yet produced a living dodo embryo, let alone a hatchling. The timeline stretches across years, not months. And even if the science succeeds, questions remain about where such birds would live, how they would fit into modern ecosystems, and what it would mean to release a resurrected species into a world that has changed entirely since its extinction.
For now, the dodo exists only in the laboratory—in genetic sequences, in edited cells, in the careful work of scientists who believe that extinction, at least in some cases, need not be permanent. The next chapter will be written in incubators and controlled environments, in the slow accumulation of data and the careful testing of each new generation of embryos. Whether the dodo will actually walk the earth again remains uncertain. But for the first time in three hundred years, the possibility is no longer purely theoretical.
Notable Quotes
We have assembled a complete dodo genome and are working with embryonic cells— Colossal Biosciences researchers
The dodo represents both what human action can eliminate and what science strives to recover— Project researchers
The Hearth Conversation Another angle on the story
Why does the dodo matter so much for this project? There are other extinct birds they could have chosen.
The dodo is the most famous extinction in human history. It's the symbol people recognize instantly. But more than that—it's a clean case. We have preserved remains, we know roughly what it looked like, and we have living relatives to work from. It's the proof of concept.
What happens if they actually succeed? Do they just release dodos back into Mauritius?
That's the question nobody has fully answered yet. The island has changed completely in three hundred years. The ecosystem that supported dodos is gone. You'd need to create a habitat, manage the population, figure out how they interact with modern species. It's not just about the science—it's about what comes after.
Is this really about saving the dodo, or is it about proving the technology works?
Both. The dodo is the demonstration project. But the real application is for species that are still alive but dying out. If this works, you could theoretically rescue animals with populations so small they've lost genetic diversity. That's where the conservation impact actually lives.
How confident are they that this will work?
They're saying embryos could develop in years, but that's a long way from a living bird. Every stage has failed before. The DNA is degraded. The editing is imprecise. The gestation systems don't exist yet. They're being cautiously optimistic, which is probably honest.
What's the biggest obstacle right now?
Probably the biological one. You can sequence a genome, but making it function inside a living cell—making it develop properly, making it viable—that's where most projects fail. They're not just editing genes; they're trying to resurrect an entire organism's developmental blueprint.