Imagine you're walking along the beach of a small Indonesian island, the pounding surf in your ears and thoughts of your next fruity drink filling your mind. Then the world's largest and most intelligent lizard, the Komodo dragon, lumbers into your path, its forked tongue flicking the air incessantly, while its clublike tail drags through the sand, marking your last days. Got that image?
Now go back in time 68 million years or so. You're hiking through the woods enjoying the prehistoric scenery when the forest fills with the roar of the great lizard king, Tyrannosaurus rex. Oh, and both beasts haven't eaten in a while. So which scenario, if either, makes you want to run like one of those cartoon characters with the windmilling legs?