The northern white rhino is a near-extinct species: the last male, Sudan, died in March 2018 and there are only two females left, both infertile.
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Scientists had been saving sperm from the last four white rhino bulls. Now, for the first time, they found a way to create hybrid embryos by applying the test-tube fertilization (IVF) technique. They combined oocytes extracted from a female southern white rhino, a similar sub-species, with the thawed sperm. The hybrid embryos are ready enough to breed but a surrogate southern white rhino female still hasn’t been identified.
Read more in “Rhino Embryos Created in Lab, Offering Hope for Nearly Extinct Species”
https://video.nationalgeographic.com/video/news/180706-white-rhino-ivf-hybrid-embryo-animals-vin
White Rhinos Are Nearly Extinct – But This Test-Tube Embryo May Help Save Them | National Geographic
https://youtu.be/AO3IWKb2q5s
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