I laughed when Steven Spielberg said that cloning extinct animals was inevitable. But I'm not laughing anymore, at least about mammoths. This is going to happen. It's just a matter of working out the details.
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There is no good scientific reason to bring back an extinct species. Why would one bring them back? To put them in a theme park?
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When I was a young boy, I used to gaze through the microscope of my father at the insects in amber that he kept in the house. And they were remarkably well preserved, morphologically just phenomenal.
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We know African and Asian elephants can interbreed, and they're separated by 5 million to 6 million years.
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Teeth actually turn out to be one of a couple of good sources of ancient DNA. The teeth, actually the enamel, is quite good at preserving the DNA, so it is a bit of time capsule so to speak.
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If we brought the mammoth back to Siberia, maybe that would be good for the ecosystems that are changing because of climate change.
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Typically, there's a drive in science to do something just to say you've done it.
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You can go into caves, and they can maintain constant conditions of temperature and humidity over long periods of time, even though the outside temperature may be way above what it is inside the cave.
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There's no environment I can think of that would have remained constant enough to preserve dinosaur DNA.
