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At first glace, Pando Forest in Utah, United States looks like a regular forest of aspen trees; in fact, they are regular – except for the fact that they’re all genetically identical to one another.

Though it looks like a forest, the whole thing is actually a single organism. Every tree — or stem, technically — is genetically identical, and the whole forest is linked by a single root system. Pando’s aspens reproduce asexually by sprouting new stems from the root structure.With over 40,000 stems and a weight of 13 million pounds, the Pando clonal colony is the heaviest known organism in the world. It’s also among the oldest living things on the planet — the root system is an estimated 80,000 years old.