A rare fragment of a Dodo femur bone is displayed for photographs next to an image of a member of the extinct bird species at Christie's auction house's premises in London, March 27, 2013. Colossal Biosciences has raised an additional $150 million from investors to develop genetic technologies that the company claims will help to bring back some extinct species, including the dodo and the woolly mammoth. Other scientists are skeptical that such feats are really possible, or even advisable for conservation. (AP Photo/Matt Dunham, File)
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