| Diet | Herbivore |
| Height | 6m |
| Length | 26m |
| Weight | 20 tonnes |
| Environment | Land |
| Era | Jurassic |
| Period | Late Jurassic |
| Type | Sauropod |
| Location | China |
Mamenchisaurus was a remarkable sauropod dinosaur that lived in what is now China during the Late Jurassic period, approximately 168 to 120 million years ago. This extraordinary creature is renowned for having one of the longest necks of any animal that ever lived, with its neck making up nearly half of its total body length. Most species ranged from 15 to 26 metres in length, though some undescribed fossils suggest certain individuals may have reached an astounding 35 metres.
The massive neck of Mamenchisaurus contained up to 19 vertebrae, far more than most other sauropods, and was supported by long, overlapping ribs that helped keep it rigid. This incredible adaptation allowed the dinosaur to browse vegetation at extraordinary heights without moving its body, making it an extremely efficient feeder in the forests of ancient China.
As a herbivore, Mamenchisaurus used its long neck to reach high into the canopy of conifers and ferns, stripping leaves with its peg-like teeth. The dinosaur's body was typical of sauropods, with four massive pillar-like legs supporting its enormous weight, a long whip-like tail for balance, and a relatively small head compared to its body size.
Fossils of various Mamenchisaurus species have been discovered in the Sichuan Basin and Yunnan Province of China, with some species dating to the Early Cretaceous period. However, questions remain about the validity of some species assignments, and paleontologists continue to study these magnificent creatures to better understand their evolution and relationships.
Mamenchisaurus possessed an extraordinarily long neck that comprised nearly half its total body length, supported by up to 19 neck vertebrae with overlapping ribs. Its neck was proportionally longer than almost any other known dinosaur, allowing it to reach vegetation up to 14 metres high.
Mamenchisaurus likely moved in herds across the ancient Chinese landscape, using its incredible neck reach to browse high vegetation without competition from shorter dinosaurs. The overlapping neck ribs suggest it held its neck relatively horizontally rather than vertically upright, sweeping it from side to side to efficiently strip foliage from wide areas.
Mamenchisaurus has appeared in several dinosaur documentaries and children's books about prehistoric life, though it is less well-known in popular culture than other famous sauropods like Brontosaurus.
Mamenchisaurus was first described by C.C. Young in 1954. The original fossils were discovered at Sichuan Basin, China.
