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In 1979, two hikers in the Ojito Wilderness Area northwest of Albuquerque, New Mexico stumbled upon a colossal discovery: four enormous, largely intact fossilized dinosaur bones. For the next 25 years, the mystery of the Seismosaurus, or "Earth-shaking lizard," unraveled. Earthshaker tells this fantastic story, from the thrill of discovering the world's longest dinosaur to "Sam's" public debut in a Jurassic exhibit at the New Mexico Museum of Natural History & Science. Through interviews and 3D animation, viewers glimpse the 30-ton Seismosaurus as it would have appeared 150 million years ago. During the program, scientists speak about how the land-roaming herbivore lived and speculate about the cause of its extinction.