Giant Sequoia, Trunk Comparison, Sequoia National Park, California

Special properties in the bark of a Giant Sequoia tree (Sequoiadendron giganteum), center, protect the tree from damage that affects other trees. Chemical tannins in the bark and wood resist disease, rot, insects, and other causes of decay. Its thick, fibrous bark also provides insulation against fire. A tree that isn't similarly protected (left) is covered with moss. The Giant Sequoia's unique properties can help it live 3,000 years or more.

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Special properties in the bark of a Giant Sequoia tree (Sequoiadendron giganteum), center, protect the tree from damage that affects other trees. Chemical tannins in the bark and wood resist disease, rot, insects, and other causes of decay. Its thick, fibrous bark also provides insulation against fire. A tree that isn't similarly protected (left) is covered with moss. The Giant Sequoia's unique properties can help it live 3,000 years or more.