Quaking Aspen.
Though it sounds like the heavy in a grade B science fiction flick, the Pando clone, made up of 47,000 tree trunks covering 106 acres and weighing some 13 million pounds, is real. It's a single organism, a quaking aspen that began life as a single seed-possibly tens of thousands of years ago-and spread by sending up shoots from an expanding root system. (is Latin for "I spread.") Each trunk is genetically identical and no more than 150 years old, but the root system may be the oldest living organism on the planet.