The New Mexico Museum of Natural History and Science showcases with spectacular effect New Mexico's prehistoric life as it was millions of years ago, when dinosaurs roamed where we now live. Visitors enter the Mesozoic era of the largest of lizards, welcomed by life-size New Mexico dinosaurs cast in bronze—and nicknamed Spike and Alberta—before a face-to-face encounter with a Tyrannosaurus rex in full attack mode. "Stan," who once weighed about six tons, is a replica of a nearly complete skeleton found in South Dakota. Fossils of Stan's relatives have been discovered all over "The Tyrannosaur State," known as New Mexico. Parts of one found in 1997 in the badlands of the San Juan Basin are on exhibit in The Bisti Beast. The museum takes learning-and-fun approach to informal science education that visitors enjoy in permanent exhibitions that include an active walk-through volcano, realistic Ice Age cave, living forest, and marine aquarium. Ever changing are presentations in the Planetarium and Extreme Screen DynaTheater, and visitors can do their own thing—and touch everything on exhibit—in the Naturalist Center.