Hello, I'm an expert in the field of biology and ecology. When it comes to the largest living organisms on Earth, there are a few contenders, but one of the most impressive is the Olympic National Park in Washington State, which is home to a massive, ancient Quercus garryana, commonly known as the Giant Douglas-fir. This particular tree is estimated to be over 1,000 years old and is one of the largest Douglas-firs in the world.

However, if we're talking about the largest living thing in terms of mass, the title goes to the Olympic National Park in Washington State, which is home to a massive, ancient Quercus garryana, commonly known as the Giant Douglas-fir. This particular tree is estimated to be over 1,000 years old and is one of the largest Douglas-firs in the world.

In terms of the largest living organism by volume, the distinction goes to a fungus in the Blue Mountains of Oregon. This Armillaria ostoyae honey fungus covers an area of approximately 3.7 acres and is believed to be over 2,400 years old, making it one of the oldest living organisms as well.

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The world's largest living thing is even bigger than a blue whale (which happens to be the largest animal living now). Meet Armillaria ostoyae, or, as it's nicknamed, the Humongous Fungus. It's an organism that covers 2,385 acres (almost 4 square miles) of the Malheur National Forest in Oregon.read more >>