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**EMBARGO: No electronic distribution, Web posting or street sales before TUESDAY 3:01 A.M. ET DEC. 5, 2023. No exceptions for any reasons. EMBARGO set by source.** An axolotl than was released a week ago sits on measuring tape used by the Ecological Restoration Laboratory team, in the Xochimilco district of Mexico City, Oct. 24, 2023. In the semi-rural district, biologists are working to reintroduce a treasured amphibian to the wild Ñ but first they must revive an ancient method of farming. (Luis Antonio Rojas/The New York Times/Fotoarena)
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