Dinosaurs · Large ornithopod

Probactrosaurus

Say it proh-bak-troh-sore-us. The name means ‘before Bactrosaurus’.

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

Length: 6 m
Diet: Plant-eater
When: Early Cretaceous121 to 99 million years ago
Fossils found in: China
Named by: Rozhdestvensky (1966)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Euornithopoda › Iguanadontia › Euiguanadontia › Dryomorpha › Ankylopollexia › Iguanodontoidea

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

Large ornithopods. Big plant-eaters that walked on two or four legs, including the duck-billed dinosaurs. See all 36

Lived at the same time

Archaeoceratops · same country
Equijubus · same country
Gobisaurus · same country
Psittacosaurus · same country
Protarchaeopteryx · same country
Sinornithosaurus · same country
Beipiaosaurus · same country
Confuciusornis · same country

Other large ornithopods

Fukuisaurus Early Cretaceous
Lurdusaurus Early Cretaceous
Tenontosaurus Early Cretaceous
Equijubus Early Cretaceous
Jinzhousaurus Early Cretaceous
Ouranosaurus Early Cretaceous
Muttaburrasaurus Early Cretaceous
Iguanodon Early Cretaceous

Source: Probactrosaurus 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.