How big was a Diplodocus?
Diplodocus was about 80 to 92 ft24 to 28 m1 long, low is the average adult: the same page says scientists estimate that the averag. A very long dinosaur with a long neck and a whip-like tail.
Diplodocus next to you
Next to a child about four feet tall: Diplodocus is about 22 of you long, lying head to toe.
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Where the numbers come from
- National Park Service, Dinosaur National Monument, checked 30 October 2026.