In Utah's Fishlake National Forest in Utah there lives a massive grove of trees called Pando, which is actually a single clonal colony of a male quaking aspen (Populus tremuloides). Nicknamed the Trembling Giant, this enormous root system is comprised of some 47,000 stems that create the grove. All together – with all of the individual trunks, branches and leaves – this quivering organism weighs in at an estimated 6,600 short tons. It is the heaviest known organism on the planet, and perhaps even more impressive is its age. Conservative estimates put it at 80,000 years old, making it also the oldest living thing known to man.