| Diet | Herbivore |
| Height | 2m |
| Length | 5m |
| Weight | 800 kg |
| Speed | 25 km/h |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |
Procheneosaurus was once thought to be a distinct genus of ornithopod dinosaur that lived during the Late Cretaceous period, approximately 83.6 million years ago in what is now western North America. However, modern palaeontological research has revealed that Procheneosaurus specimens actually represent juvenile forms of the well-known crested duck-billed dinosaur Lambeosaurus, making it a junior synonym rather than a separate genus.
The specimens originally assigned to Procheneosaurus were smaller ornithopods, measuring around 5 metres in length and standing about 2 metres tall at the hip. These fossils displayed the characteristic features of hadrosaur juveniles, including proportionally larger skulls relative to body size and less developed cranial ornamentation compared to adult specimens. The confusion arose because juvenile lambeosaurs had not yet developed the distinctive hollow crests that make adult Lambeosaurus so recognisable.
Like all ornithopods in the hadrosaur family, these creatures were herbivorous, using hundreds of tiny teeth arranged in dental batteries to grind tough plant material. They inhabited the lush, subtropical forests and coastal plains of Late Cretaceous North America, feeding on ferns, cycads, and early flowering plants. The discovery and subsequent reclassification of Procheneosaurus specimens has provided valuable insights into the growth patterns and development of lambeosaur dinosaurs.
This case demonstrates how our understanding of prehistoric life continues to evolve as new discoveries are made and existing fossils are re-examined using modern techniques. The Procheneosaurus specimens remain scientifically important as they help palaeontologists understand how these remarkable crested ornithopods grew from small juveniles into the impressive adults we recognise today.
Originally thought to be a small ornithopod with a relatively large skull and lack of cranial crests. Now understood to represent juvenile Lambeosaurus specimens before their distinctive hollow crests had fully developed.
As juvenile lambeosaurs, these animals would have stayed close to adult herds for protection, learning feeding behaviours and migration patterns. They likely grew rapidly during their first few years of life before developing their characteristic crests.
Procheneosaurus was first described by Barnum Brown in 1914. The original fossils were discovered at Alberta, Canada.
