Scientists at biotech company Colossal Biosciences were able to produce genetically modified mice, a successful feat in their ongoing conservation and de-extinction efforts.

The mice were created by Colossal Biosciences, which edits DNA for species conservation, and has been working to bring back the woolly mammoth since 2021.

Scientists working to bring back the woolly mammoth have created genetically engineered mice that they say have several features of the extinct ice age giant.

Dallas-based Colossal is one step closer to bringing back the woolly mammoth.

Colossal Biosciences has engineered mice with mammoth-like traits for living in cold climates. These mice have wavy, golden coats and could be plumper.

This week, the world met the woolly “mammouse”—a genetically engineered mouse with woolly mammoth hair. The scientists at Colossal Biosciences who created it think it’s a promising step toward their goal of recreating the woolly mammoth.

While the Colossal Laboratories and Biosciences project to bring back extinct species has been compared to “Jurassic Park”, it has started at a much smaller scale than a T. Rex: woolly mammoth mice.