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Brontosaurus, more correctly known as Apatosaurus, were among the largest land animals that ever lived. They could grow to over 80 feet long and weigh approximately 35 tons. Brontosaurs is known for its very long neck useful for eating foilage off trees and shrubs. The head of a Brontosaurus was very small with one of the smallest brains of any dinosaur. The eyes and nostrils are located on the top of the head. With such a small head and a correspondingly small mouth, Brontosaurus must have spent most of the time eating to get enough nourishment from plants to sustain itself.
Brontosaurus dinosaurs lived in the Jurassic Period about 150 millions years ago. Fossils have been found in Western North America in Utah, Colorado, and Wyoming. Brontosaurus is related to other large Sauropods like Brachiosaurus, and Diplodocus which are among the largest dinosaurs ever discovered.