The technology is not quite there yet, it would be incredibly expensive, climate and habitat changes since they died out (or that caused them to die out) mean the world is not really a suitable place for them anymore, well preserved specimens of animals does not always mean that the DNA is well preserved and finally almost all animals require a form or social upbring and more often lifelong interaction from other animals of their species. For example a duck raised by chickens behaves like a chicken. How much would you actually learn about ducks from that sort of duck?
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