Triceratops, a genus of herbivorous ceratopsian dinosaur, lived during the Maastrichtian stage of the late Cretaceous period, about 68 million years ago through the Cretaceous-Paleogene extinction event 66 million years ago. Its name, meaning "three horned face", is owed to its most characteristic features—a large irony frill and three horns, which adorn its large four-legged body. Individual Triceratops are estimated to have reached about 7.9 to 9.0 meters in length, and 2.9 to 3.0 meters in height.
The Hall of Ornithischian Dinosaurs, one of two halls in the David H. Koch Dinosaur Wing, displays fossils from Ornithischians—dinosaurs characterized by a backward-pointing extension of the pubis bone, which is thought to have helped to support the enormous stomachs that these dinosaurs needed to digest the masses of tough vegetation they ate. Exhibits within this hall explore genasaurs, which are defined by the development of inset tooth rows that form cheeks, and the cerapods, identified by an uneven covering of tooth enamel.
The American Museum of Natural History (AMNH), located at Central Park West and 79th Street, comprises of 28 interconnected buildings housing 45 permanent exhibition halls, in addition to a planetarium and a library, across 2-million square feet. The collections contain over 33 million specimens of plants, animals, fossils, minerals, rocks, meteorites, human remains, and human cultural artifacts. Founded in 1869, the museum opened in the original Victorian Gothic building designed by J. Wrey Mould in 1877. A southern expansion, a rusticated Richardsonian Romanesque by J. Cleveland Cady, extends 700 feet along West 77th Street and in 1936, John Russell Pope added the overscaled Beaux Arts entrance on Central Park West.
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