Archaeornithomimus

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Learn more about Archaeornithomimus

Quick Facts
NameArchaeornithomimus
Diet
Weight50 kilos
Length3.5 meters
Height1.8 meters
Period
Archaeornithomimus
Human

Archaeornithomimus was a genus of ornithomimosaurid theropod dinosaur that originated in the Late Cretaceous of Asia about 70 million years ago. In 1923, Roy Chapman Andrews discovered the remains of Archaeornithomimus during an expedition. It was originally called Ornithomimus asiaticus but was later placed in its own genus by Dale Russel in 1972. 

It was described as a medium-sized ornithomimosaur that was about 3.4 m long and weighed between 45 and 91 kg. A dash of hard evidence showed that Archaeornithomimus had feathers, more like those of ratites, and was equipped with a keratinous beak. The hind limbs were robust. It was a long-legged dinosaur that was built for speed to easily escape its predator. It had a long tail that served as a counterweight to aid locomotion. However, there is not much information about its skull, scientists assumed it was toothless and formed a beak like the other dinosaurs in the group. Archaeornithomimus was probably an omnivore that ate plant parts, insects and small vertebrates such as lizards and mammals.

As Archaeornithomimus was from the Iren Dabasu Formation, it had shared its ecosystem with other dinosaurs such as the tyrannosaur Alectrosaurus, Avimimimus, Gigantoraptor, and even the dromaeosaurid Velociraptor.

What does the name Archaeornithomimus mean?

Archaeornithomimus means "ancient mimic bird", a genus of ornithomimosaurid theropod dinosaur. 

When did Archaeornithomimus live?

Archaeornithomimus lived in the Late Cretaceous of Asia about 70 million years ago.

What did the Archaeornithomimus eat?

Archaeornithomimus was probably an omnivore that ate plant parts, insects and small vertebrates such as lizards and mammals.

Where did they live?

When did they live?

What was your diet?

Who discovered them?

What kind of dinosaurs are they?

What type of species are they?

  • Rothschild, B., Tanke, D. H., and Ford, T. L., 2001, Theropod stress fractures and tendon avulsions as a clue to activity: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, p. 331-336.
  • Gilmore, C.W., 1933, "On the dinosaurian fauna of the Iren Dabasu Formation," Bulletin of the American Museum of Natural History, 67: 23-78.
  • Russell, D. A. 1972. "Ostrich dinosaurs from the Late Cretaceous of Western Canada," Canadian Journal of Earth Sciences 9: 375-402.
  • Galton, Peter and Smith, David, 1990, "Osteology of Archaeornithomimus asiaticus (Upper Cretaceous, Iren Dabasu Formation, People's Republic of China)", Journal of Vertebrate Paleontology Vol. 10, No. 2 (Jun. 21, 1990), pp. 255-265.
geological time 3

Fun Facts

  • Archaeornithomimus means "ancient bird imitator".
  • Archaeornithomimus was probably an omnivore that ate plant parts, insects and small vertebrates such as lizards and mammals.
  • It was a medium-sized ornithomimosaur.
  • It was a long-legged dinosaur that was built for speed to easily escape its predator.

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