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Sonoran Desert packrats have been collecting and preserving things found on the ground for 40,000 years! Stop by the Trailside Naturalist Station at the Gateway Trailhead between 8:00 and 11:00 A.M. to learn how ancient packrats and their distinctive behavior assist today’s scientists who study the history of desert plants, animals, geology and climate. Restrooms and water are available at the trailhead.

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