Oryctodromeus Facts
Pronunciation: oh-RICK-toe-dro-MEE-us
Name meaning: Digging Runner
| Diet | Herbivore |
| Height | 0.5m |
| Length | 2.1m |
| Weight | 32 kg |
| Speed | 40 km/h |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |
Oryctodromeus was a remarkable small ornithopod dinosaur that lived during the Late Cretaceous period, approximately 106-96 million years ago. This groundbreaking discovery revolutionised our understanding of dinosaur behaviour, as Oryctodromeus became the first non-avian dinosaur definitively shown to have lived in burrows. Fossils have been found in the Blackleaf Formation of Montana and the Wayan Formation of Idaho, USA.
As an ornithopod, Oryctodromeus was a herbivorous dinosaur that walked on two legs. It measured about 2.1 metres in length and stood roughly 50 centimetres tall at the hip, weighing around 32 kilograms. Despite its relatively small size, this dinosaur was built for speed and could likely run at impressive speeds of up to 40 km/h when escaping predators above ground.
The most extraordinary aspect of Oryctodromeus was its burrowing lifestyle. Its skeleton shows several adaptations for digging, including a reinforced snout, robust shoulder girdle, and powerful forelimbs. The original fossil discovery included an adult specimen found in a burrow alongside two juveniles, suggesting these dinosaurs cared for their young in underground dens, much like modern rabbits or prairie dogs.
This ornithopod's diet consisted of plants, which it would have foraged for on the surface before retreating to the safety of its burrow. The underground lifestyle provided protection from the many predators that roamed the Late Cretaceous landscape, including various theropod dinosaurs.
What made Oryctodromeus distinctive?
Oryctodromeus had a reinforced, pointed snout ideal for digging, along with unusually robust shoulder and arm bones that provided the strength needed for excavating burrows. Its hip bones were also specially adapted to anchor the powerful muscles required for digging through soil and rock.
Behaviour
Oryctodromeus lived in burrows that it excavated using its strong forelimbs and reinforced snout, creating underground dens up to 2 metres long. Adults cared for their young in these protective burrows, as evidenced by the discovery of juvenile specimens alongside an adult. When foraging above ground, they likely remained close to their burrow entrances for quick escape from predators.
Discovery
Oryctodromeus was first described by David Varricchio in 2007. The original fossils were discovered at Blackleaf Formation, Montana, USA.
Oryctodromeus FAQ
What did Oryctodromeus eat?
Oryctodromeus was a herbivore that fed on various plants available during the
Late Cretaceous period. It would venture above ground to forage for ferns, cycads, and early flowering plants, using its beak-like mouth to crop vegetation before retreating to its burrow to feed safely underground.
How big was Oryctodromeus?
Oryctodromeus was a small dinosaur, measuring about 2.1 metres in total length and standing roughly 50 centimetres tall at the hip. It weighed approximately 32 kilograms, making it similar in size to a large dog, though much more lightly built for speed and agility.
When did Oryctodromeus live?
Oryctodromeus lived during the
Late Cretaceous period, specifically during the Cenomanian stage, approximately 106.3 to 96 million years ago. This was a time when flowering plants were becoming more common and many new dinosaur species were evolving.
Where was Oryctodromeus found?
Fossils of Oryctodromeus have been discovered in North America, specifically in the Blackleaf Formation of southwestern Montana and the Wayan Formation of southeastern Idaho, USA. The original specimens were found preserved within their actual fossilised burrows.
How do you pronounce Oryctodromeus?
Oryctodromeus is pronounced 'oh-RICK-toe-dro-MEE-us'. The name comes from Greek words meaning 'digging runner', which perfectly describes this burrowing dinosaur's lifestyle and abilities.
What does Oryctodromeus mean?
The name Oryctodromeus means 'digging runner' in Greek. This name was chosen because the dinosaur was both an accomplished burrower that lived underground and a fast runner when it ventured above ground to forage for food.
How fast could Oryctodromeus run?
Scientists estimate that Oryctodromeus could run at speeds of up to 40 kilometres per hour. This impressive speed would have been essential for quickly escaping predators when foraging above ground, allowing it to dash back to the safety of its burrow.
What type of dinosaur was Oryctodromeus?
Oryctodromeus was a small ornithopod dinosaur, belonging to the family Thescelosauridae. Ornithopods were herbivorous dinosaurs that typically walked on two legs and were known for their bird-like hips and beaked mouths adapted for eating plants.
Was Oryctodromeus related to birds?
As an ornithopod, Oryctodromeus was not directly related to modern birds. Birds evolved from theropod dinosaurs, whilst Oryctodromeus belonged to the ornithischian group. However, like all dinosaurs, it shared common ancestry with birds much earlier in evolutionary history.
How many Oryctodromeus fossils have been found?
The original discovery included one adult Oryctodromeus found with two juveniles in a single burrow, and additional specimens have been found since the initial 2007 description. However, Oryctodromeus remains relatively rare in the fossil record, likely because their burrowing lifestyle made preservation less common.
