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Since the disappearance of the last male northern white rhino in 2018, only a mother and daughter remain as representatives of the species in a Kenyan reserve. Mammoths, which became extinct 4,000 years ago, are attracting the interest of the private American laboratory Colossal Biosciences. Its researchers are working to produce ex vivo (with artificial wombs) embryos from cells harvested from mammoths, liberated from the thawed soils of Siberia, and from Asian elephant oocytes, 99.6% of whose genome matches that of the ancient mastodon. They hope to have their first baby mammoth by 2028.