Iguanacolossus Facts
Pronunciation: ih-GWAN-ah-koh-LOSS-us
Name meaning: Giant Iguana
| Diet | Herbivore |
| Height | 4m |
| Length | 10m |
| Weight | 4.5 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Early Cretaceous |
| Type | Ornithopod |
| Location | North America |
Iguanacolossus was a massive ornithopod dinosaur that roamed the ancient landscapes of North America during the Early Cretaceous period, approximately 139 million years ago. This impressive herbivore earned its name, meaning 'giant iguana', from its enormous size and its relationship to the famous Iguanodon. Living in what is now Utah, Iguanacolossus inhabited a warm, humid environment filled with conifers, ferns, and early flowering plants.
Standing about 4 metres tall at the hip and stretching up to 10 metres in length, Iguanacolossus was one of the largest ornithopods of its time. Weighing an estimated 4.5 tonnes, this gentle giant possessed the characteristic ornithopod features including a duck-like bill for cropping vegetation, powerful hind legs for both walking and running, and smaller front limbs that could be used for both walking and food gathering. Its body was built for processing tough plant material, with rows of grinding teeth perfectly adapted for breaking down fibrous vegetation.
Like other ornithopods, Iguanacolossus was primarily bipedal but could drop down to all fours when feeding or moving slowly. Its discovery has provided valuable insights into the evolution of large ornithopods during the Early Cretaceous, representing an important link between earlier forms like Iguanodon and later duck-billed dinosaurs. The well-preserved skeleton found in Utah has allowed scientists to better understand how these magnificent plant-eaters adapted to their changing world.
What made Iguanacolossus distinctive?
Iguanacolossus was distinguished by its massive size, being one of the largest ornithopods of the Early Cretaceous period. It possessed a broad, duck-like bill for cropping vegetation and powerful, muscular hind legs that supported its impressive 4.5-tonne frame.
Behaviour
Iguanacolossus likely lived in herds, moving through forests and open areas in search of suitable vegetation. As a large herbivore, it would have spent much of its day feeding, using its specialised bill to crop tough plants and its grinding teeth to process fibrous material before swallowing.
Discovery
Iguanacolossus was first described by Andrew T. McDonald in 2010. The original fossils were discovered at Cedar Mountain Formation, Utah, USA.
Iguanacolossus FAQ
What did Iguanacolossus eat?
Iguanacolossus was a herbivore that fed on the plants available in
Early Cretaceous North America, including conifers, ferns, cycads, and early flowering plants. It used its broad, duck-like bill to crop vegetation and had rows of grinding teeth to process tough, fibrous plant material.
How big was Iguanacolossus?
Iguanacolossus was a massive dinosaur, standing about 4 metres tall at the hip and measuring up to 10 metres in total length. It weighed approximately 4.5 tonnes, making it one of the largest ornithopods of the
Early Cretaceous period.
When did Iguanacolossus live?
Iguanacolossus lived during the
Early Cretaceous period, approximately 139.1 million years ago. This places it in a time when flowering plants were just beginning to diversify and many familiar dinosaur groups were evolving.
Where was Iguanacolossus found?
Iguanacolossus fossils were discovered in the Cedar Mountain Formation in Utah, USA. The holotype specimen represents one of the most complete
Early Cretaceous ornithopod skeletons found in North America.
How do you pronounce Iguanacolossus?
Iguanacolossus is pronounced 'ih-GWAN-ah-koh-LOSS-us'. The name combines 'iguana' with 'colossus', reflecting both its relationship to
Iguanodon and its impressive size.
What does Iguanacolossus mean?
Iguanacolossus means 'giant iguana'. The name reflects its enormous size and its relationship to other iguanodontian dinosaurs like
Iguanodon, though it was not actually related to modern iguanas.
How fast could Iguanacolossus run?
The exact running speed of Iguanacolossus is unknown, but as a large ornithopod with powerful hind legs, it was likely capable of reaching reasonable speeds when necessary, though it probably moved relatively slowly most of the time whilst feeding.
What type of dinosaur was Iguanacolossus?
Iguanacolossus was an ornithopod dinosaur, specifically belonging to the family Iguanodontidae. Ornithopods were plant-eating dinosaurs known for their bird-like hips and specialised teeth for processing vegetation.
Was Iguanacolossus related to birds?
As an ornithischian dinosaur, Iguanacolossus was not directly related to modern birds. Birds evolved from theropod dinosaurs, which belonged to the other major group called saurischians. However, all dinosaurs, including Iguanacolossus, share common ancestry with birds.
How many Iguanacolossus fossils have been found?
Iguanacolossus is known primarily from a single, well-preserved holotype specimen (UMNH VP 20205) representing one individual. This partial skeleton is remarkably complete for an
Early Cretaceous ornithopod and has provided valuable scientific insights.
