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The world's largest living organism is a fungus.

The Armillaria ostoyae fungus, also known as the honey mushroom, covers over 2,200 acres in Oregon, USA. It's estimated to be around 2,400 years old, making it not only the largest living organism but also one of the oldest. This massive fungus was discovered in 1998 and is considered a single individual because it's all connected by a vast network of fungal mycelium. Its immense size and age have earned it a spot in the Guinness World Records.