Apatosaurus from AMNH

Apatosaurs were a genus of sauropod dinosaurs, the long-necked saurischian ("lizard-hipped") herbivores that were among the largest land animals ever to have lived on Earth. There are several known species in the genus, including A. excelsus, A. louisae, A. parvus, and the type species, A. ajax. In the early years of dinosaur paleontology, bones from an Apatosaurus were mistakenly included in a skeleton which also included bones from a Brachiosaurus and a Camerasaurus. This incorrect reconstruction was given the name "Brontosaurus" and although scientists discovered the mistake back in 1903 and officially retired the name, this nonexistent genus is still sometimes mistakenly used to refer to Apatasaurus in popular writings. Mass estimates for various species of Apatosaurs range from 16 to 39 tons. Apatasaur species have been found in upper Jurassic rocks, from 154 to 150 million years ago.
This digital 3D model is a scan of an object found in the American Museum of Natural History. T