Diplodocus is one of the best-known and most easily identifiable dinosaurs with its long neck and tail, and its sturdy legs. It lived during the Jurassic Period. It was first found by S.W. Williston in 1877 in western North America. It was the longest dinosaur known for many years. Its size may have been a deterrent to predators such as Allosaurus, whose remains have been found in the same layers of rock, suggesting they lived at the same time and place.


  • Estimated size: 54 meters (177 feet)
  • Estimated weight: 11-17.6 tons

Size compared to human

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