Today, Sept. 17, 2025, Colossal has announced a breakthrough in culturing pigeon primordial germ cells (PGCs), a crucial step in hatching the first dodo in more than 300 years. Cloning birds is hard, but it just got a little easierMicroscope image of pigeon PGCs cultured by Colossal Biosciences. Photo of a windowed egg, allowing researchers to retrieve and inject Primordial Germ Cells (PGCs) at the desired stage of development. How Colossal plans to bring back the dodoIllustration of a dodo, which went extinct in the 1700s. Much of that work has been completed, but you don’t start cooking up extinct birds until you’re sure you’ve got the recipe right.