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All around the world, scientists are working to recreate lost animal species such as the mammoth. Using modern genetic techniques, they’re extracting ancient genetic material from museum exhibits. However, these practices are also attracting criticism. Biology researchers question the usefulness of revived species for natural habitats. They fear that the excitement surrounding the idea of bringing back extinct species could distract people from the many problems that cause animals to disappear, in the first place. Are some scientists playing God - with unforeseeable consequences for the environment?