After three years of restoration, the Mariposa Grove, the home of about 500 mature giant sequoias, is open again. One of the trees, called the Grizzly Giant, is estimated to be 1,800 or so years old. The typical sequoia there measures nearly 100 feet in circumference, one-third of a football field’s length, and has bark more than one foot thick and high levels of tannins.
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