That's easy! I would breed a bunch of turtle-kangaroo hybrids and put timed nukes inside them. Then when all the important countries come and put them in zoos, I just have to wait a few months for them to explode. Of course, they'd have to be pretty big to fit a nuke AND vital organs inside them. After they've all blown up, I would get off my deserted island inhabited by dune buggies and run around in a chicken suit and claim all the countries for myself.