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Spanning 107 acres and weighing 6,615 tons, Pando was once thought to be the world’s largest organism (now usurped by thousand-acre fungal mats in Oregon), and is almost certainly the most massive. In terms of other superlatives, the more optimistic estimates of Pando’s age have it as over one million years old, which would easily make it one of the world’s oldest living organisms. - www.atlasobscura.com