>>12334De-extincting species might be useful to repair biomes. However i don't see the reason to do this if you don't have an ecological niche to put said species into. I mean could mammoths survive in the wild ? If you're just going to bring a few back as a zoo-attraction, you're not really bringing back the species, you just create a few of these animals and when the novelty wears off the zoo will 'discontinue the mammoth'.