Diplodocus

Say it DIP-low-DOCK-us. The name means ‘double beam’.

Diplodocus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of sauropods

Length: 26 m
Weight: 15 tonnes
Diet: Plant-eatersoft plants and leaves from trees
Walked: On 4 legs
When: Late Jurassic152 to 145 million years ago
Fossils found in: USA
Named by: Marsh (1878)
Family tree: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Diplodocidae

Where Diplodocus sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59

Lived at the same time

Allosaurus · same country
Apatosaurus · same country
Barosaurus · same country
Brachiosaurus · same country
Camptosaurus · same country
Ceratosaurus · same country
Coelurus · same country
Dryosaurus · same country

Other sauropods

Apatosaurus Late Jurassic
Brachiosaurus Late Jurassic
Brachytrachelopan Mid Jurassic
Camarasaurus Late Jurassic
Dicraeosaurus Late Jurassic
Euhelopus Late Jurassic
Europasaurus Late Jurassic
Giraffatitan Late Jurassic

Source: Diplodocus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.