Brontosaurus

Brontosaurus (/ˌbrɒntəˈsɔːrəs/[1] [2] ; meaning "thunder lizard" from Greek βροντή, brontē "thunder" and σαῦρος, sauros "lizard") is a genus of gigantic quadrupedsauropod dinosaurs. Although the type species, B. excelsus, had long been considered a species of the closely related Apatosaurus,[3]  researchers proposed in 2015 that Brontosaurus is a genus separate from Apatosaurus and that it contains three species: B. excelsus, B. yahnahpin, and B. parvus.[4]

Brontosaurus had a long, thin neck and a small head adapted for a herbivorous lifestyle; a bulky, heavy torso; and a long, whip-like tail. The various species lived during the Late Jurassic epoch in the Morrison Formation of what is now North America, and were extinct by the end of the Jurassic.[5]  Adult individuals of Brontosaurus are estimated to have weighed up to 15 tonnes (15 long tons; 17 short tons) and measured up to 22 metres (72 ft) long.

As the archetypal sauropod, Brontosaurus is one of the best-known dinosaurs and has been featured in film, advertising, and postage stamps, as well as many other types of media.