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Wouldn’t it be great to have vast herds of mammoths roaming the Canadian tundra, or a thrill to see flocks of hundreds of millions of passenger pigeons settling in Michigan forests once again to gobble down vast amounts of beech mast and supply succulent squabs to Chicago restaurants? Or maybe enjoy watching flights of Carolina parakeets over southern farms, or at least observe a living pair of saber-toothed cats in a cage in a zoo. Of course, being able to rent a pair of velociraptors to add spice to the "reality" TV show you’re directing would be nice too.

An appealing picture to say the least: Jurassic Park in reality, bringing vanished animals back to life, made possible by spectacular progress in molecular biology. After all, isn’t Homo sapiens destined to use its fine brains to engineer the entire planet (or universe)? But let’s restrict our dreaming to recreating organisms that Homo sapiens has itself exterminated. Surely, if that’s an achievable goal, and we want to do it, humanity should go full speed ahead and resurrect the creatures we have...