Apatosaurus: quick facts

Apatosaurus is one of the best known of all dinosaurs but usuallyby its more popular name "Brontosaurus". Its 20-foot-long necksupported a rather small head and its brain was about the size of a large

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Reference background: Natural History Museum, London — Dinosaurs; Smithsonian National Museum of Natural History — Dinosaurs; American Museum of Natural History — Dinosaurs & Fossils. Figures are typical published ranges; taxonomy follows the source era and modern consensus is noted where it differs. See our sources & fact-check policy.