The last woolly mammoths died out about 4,000 years ago, but if the folks at Colossal Biosciences have their way, a calf will be born by 2028. Scientists at the company aim to rebuild the woolly mammoth genome using samples from unearthed specimens, filling in the gaps with DNA from modern Asian elephants. They then have to coax woolly mammoth embryos into elephants and find tribal and governmental partners willing to let the company release - or 're-wild' - woolly mammoths onto their land.
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