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Which is the largest living organism on Earth?

NatureFungi

Quick Answer

A honey fungus colony in Oregon is often cited as the largest living organism on Earth. The Armillaria ostoyae colony covers about 965 hectares, or 9.65 square kilometers.

The Full Story

One of the most famous candidates for the largest living organism is a honey fungus colony of Armillaria ostoyae in Oregon’s Blue Mountains. It spreads underground across about 965 hectares, or 9.65 square kilometers. Although it looks like many separate fungi, genetic testing shows it is one organism. Because fungi can grow as vast connected networks, size can be measured very differently than in animals or trees.

Key Facts

1.It covers about 965 hectares
2.That is roughly 9.65 square kilometers
3.It is a single fungal organism

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"The biggest living thing on Earth is hidden underground"