Diplodocus was larger than a tennis court and weighed only as much as two elephants. When people think of huge sauropods like Brachiosaurus, they should remember that the Diplodocus may emerge victorious in a fictional deathmatch, considering its powerful 45 foot long tail (consisting of atleast 80 caudal vertebrae) that was as flexible as a whip.


The latest science research has shown us the amazing feats of this dinosaur. Here are 5 amazing facts about Diplodocus, from its genius architecture to its physical feats.

  • Where it Lived – North America
  • Habitat – Floodplains
  • Size – 89 feet (45 foot long tail)
  • When it Lived – Late Jurassic, 155-145 million years ago


Most of Diplodocus‘ length came from its extremely long tail, so long that forced it to graze on low-growing ferns instead of taking it to the high ground like Brachiosaurus. This tail consisted of rodlike bones at its end. The interesting part about the middle of its tail was the fact that it had twin extensions called chevrons in its bones that could’ve protected its blood vessels against excessive force. It was called the “double beam” tail.

This architecture made the tail strong so it can use it as a counter-balance or use it to scare off predators by using noise made from its whiplashes against the ground. Some scientists speculate it was also used for active defending. In other words, it could have fought off large predators quite well since 80 caudal vertebrae makes up a lot of weight on the outside. When that much weight hits at breakneck speeds, there is going to be major damage to the predator’s bones and blood vessels. If anything, the tail would’ve made the perfect deterrent for attacks.

Diplodocus Tail


Diplodocus was nearly 90 feet long but its range of weight lies between 11-17.6 tons, which is light for a dinosaur of its size. This is possible because most of that length comes from its long slender neck and tail. There are deep hollows in the spinal bones that significantly reduce the weight, making movement more fluid.

It would give Diplodocus better agility and helped it swing its neck side to side to tear ferns with its teeth. The movement is needed since it was a slow-moving animal.


Diplodocus’s neck was so long and difficult to lift that its posture was almost always horizontal. That’s why it grazed on low-growing ferns instead of leaves on tall trees. Using its tail and neck to sweep the vegetation as it fed with its peg-shaped teeth, the dinosaur had the diet part handled.

Like many grazing animals today, Diplodocus may have used swallowed stones to grind up the fronds in its stomach for better digestion.


Diplodocus is the ‘standard’ species of the Diplodocid family. Other sauropods like Apatosaurus were just as long as Diplodocus but much heavier, nearly as much as five elephants, due to the thicker bones. Dinosaurs like Barosaurus was very similar to Diplodocus except a third of its entire length was made up by the neck, or cervical vertebrae. Barosaurus had the same number of neck bones but each bone was stretched, making it so long that the dinosaur’s center of gravity was near its hips. Like Diplodocus, its front limbs were shorter than the hind limbs.

Supporting weight when rearing back to raise the neck is important. Barosaurus used that advantage to hold its neck nearly fifty feet off the ground. Other sauropods like Seismosaurus and Supersaurus made Diplodocus’s size look small, measuring well over 100 feet long.


Paleontologists used to think Diplodocus had a “second brain” but now confirm that it’s just an enlargement of the spinal cord in the area of the hip – an enlargement that was actually bigger than its tiny actual brain. In terms of the EQ quotient (Encephalization Quotient), its brain relative to its body weight was in the lowest ranks of all dinosaurs.

Diplodocus traveled in herds and migrated when food was scarce. An interesting fact is that Diplodocus laid its eggs as it walked like other sauropods in a linear fashion – their eggs have never been found in circles. The life expectancy was similar to other sauropods – around 100 years.



David Lambert, Darren Naish, and Elizabeth Wyse. “Double Beams.” Encyclopedia of Dinosaurs and Prehistoric Life. DK Publishing, 2008.

“Diplodocus”, Enchanted Learning.