Re: ps...
I am a lot more concerned about the work being done in microbiology labs than about any "cloning" of large animals. The human race has shown its expertise over many thousands of years in pretty much being able to deal with any large nasty animals that might show up. If you set fifty T-Rexes loose somewhere, you might lose a few people, but the life expectancy on the dinosaurs could probably be measured in days. We spend a long time working our way up to the top of the food chain, and we've pretty much got a lock on the position.