Jurassic Park? Movies have always depicted what could and, without fail, always goes wrong. I'm sure there were scares about some "mad" doctor grafting body parts from one person to another. We do it all the time with success (liver, kidney, lung transplants). You don't hear about a pancreas that took over and reeks havoc to a small town. We went to the moon and no to many aliens there. We go out to sea and rarely do giant squid take down our naval ships.
There are plenty of endangered species that are having trouble surviving as we speak. Black-footed ferrets may make a comeback. Pandas are slowly thriving and Ocelots. I don't think the Giant Panda and ocelots are wimpy creatures that have many predators, yet they can't seem to get the population stable.
If we have trouble with endangered species from going extinct, I highly doubt trying to keep 5 or so Mammoths from getting out of hand. I say "about 5" because you can't expect to clone two mammoths (each male/female) to breed. What if you picked the "Audrey Hepburn" and tried to pair it up to the dumb "mouth-breather" mammoth. How's the phrase go?:
"I wouldn't even if you were the last Wooly Mammoth on Earth"......
also....would the phrase "let's address the Wooly Mammoth in the room" trump the elephant idiom?