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In vitro fertilization may save white rhinos from extinction
Scientists achieve first successful embryo transfer in rhinos, a breakthrough for conservation of northern white rhinoceros. Only two northern white rhinos remain: Najin, 33, and Fatu, 23. Majority of population killed by poachers. Researchers successfully impregnated a southern white rhino, but she died before delivery. 30 preserved northern white rhino embryos stored for transfer to southern white rhino surrogates.