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National Geographic: Climbing Redwood Giants

Ancient and majestic, the Pacific coast's redwoods tower more than 300 feet above the forest floor. Join redwoods researcher Steve Sillett for a unique, vertical tour of these giants, climbing their trunks and exploring their massive crowns. Aerial laser surveys reveal hidden ecosystems and strange predators living in the forest canopy. Meanwhile, back on the ground, explorer Mike Fay charts the past and assesses the future of these primeval trees.