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![Scientists are trying to "de-extinct" the passenger pigeon by modifying the genes of more common pigeons. These birds have been altered so their offspring will be easier to edit with CRISPR. (Credit: Ben Novak)](https://cdn.discovermagazine.com/assets/image/4886/passengerpigeoncrispr-xs.webp "Scientists are trying to "de-extinct" the passenger pigeon by modifying the genes of more common pigeons. These birds have been altered so their offspring will be easier to edit with CRISPR. (Credit: Ben Novak)")
