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Mamenchisaurus was about 72 feet (21.9 meters) long, and weighed around 12 tons.
The first fossils of Mamenchisaurus, a partially complete skeletion, were discovered in 1952 during the construction of the a road in Sichuan, China. This specimen was studied and named by Professor C. C. Young in 1954. Young chose the name Mamenchisaurus constructus in honor of the fact that the first specimen had been found on a construction site near to the Mamingxi Ferry Crossing.
The most notable feature of Mamenchisaurus is its very long neck, the longest neck of any known dinosaur (and in fact of any animal in history). A second species of Mamenchisaurus, with an even longer neck than the first species, which has been named Mamenchisaurus hochaunensis was found in the United States in 1994. Mamenchisaurus hochaunensis is believed to have a neck that may have reached up to 49 feet (15 meters) in length.
Scientists generally believe that Mamenchisaurus would have reared up on its hind legs, and used its long neck to reach foliage that was out of reach to other dinosaurs. A replica Mamemchisaurus skeleton was displayed in this position at the Field Museum of Natural History in Chicago in 2005 to 2006.
Mamenchisaurus was a herbivore (plant-eater) that lived from 156 to 145 million years ago
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