Tweaking Genes to Save Species

On islands around the globe, invasive rodents are obliterating native plants and animals — many of which exist nowhere else. By some estimates, 90 percent of these archipelagos are plagued by nonnative rodents. Eradicating them could restore ecosystems and let evolutionary processes resume unfettered. The current method, poison, is a costly, labor-intensive one that also risks harm to native animals.

Scientists are developing advanced genetic techniques to ensure that all mouse offspring are male. No females, no babies, no more invasive rodents.

Such targeted conservation “would be transformative in our ability to deal with invasive rodents, which are a major extinction driver,” says Josh Donlan, an ecologist, expert in island conservation, and director of the nonprofit Advanced Conservation Strategies.

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