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Learn more about Edmontonia

Quick Facts
Weight3200 kilos
Length7 meters
Height3 meters

Edmontonia was a genus of armored dinosaur that lived in the Late Cretaceous period. In 1915, fossils were first discovered in the Edmonton Formation, known to be the last of the uncloned ankylosaurs to date.

Looking at Edmontonia's appearance, it would not be an easy meal for a hungry tyrannosaur. Like other ankylosaurs, it was bulky and tank-like designed to stay and fight rather than flee. It had many sharp spikes along its back and tail and small, ridged bony plates on its back and head. There were four larger spikes on the shoulders on each side, two of which were divided into subspines in some specimens. Its skull was pear-shaped. The back in the neck area was protected by a large flat keeled (ridged) plate, while smaller keeled plates covered the back, hips and tail. It walked on all fours and was a plant eater. 

One Edmontonia male fought for territory and females. Other large males used their large shoulder spikes for shoving contests. They also hung out alone. The tail was probably a sharp, bony whip, probably good for whipping the tyrannosaur's legs and driving them back.

The estimated size of Edmontonia was 6.6 m in length and weighed 3 tons.

What does Edmontonia eat?

Edmontonia was a dinosaur that ate low plants, such as ferns and cycads.

How does Edmontonia defend itself from predators?

Looking at Edmontonia's appearance, it would not be an easy meal for a hungry tyrannosaur. It could protect itself with its bulky, tank-like design to stay and fight rather than flee when threatened. They usually crouched down to prevent the attacker from being flipped over. The tail was also probably a sharp, bony whip, probably good for lashing the tyrannosaur's legs and driving them back.

When does Edmontonia live?

Edmontonia was a genus of armored dinosaurs that lived in the Late Cretaceous period about 67-65 million years ago. 

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?

  • "Edmontonia." In: Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. The Age of Dinosaurs. Publications International, LTD. p. 141. ISBN 0-7853-0443-6.
  • Paul, G.S., 2010, The Princeton Field Guide to DinosaursPrinceton University Press p. 238.
  • Carpenter, K. 1990. "Ankylosaur systematics: example using. Panoplosaurus and Edmontonia (Ankylosauria: Nodosauridae)", In: Carpenter, K. & Currie, P.J. (eds) Dinosaur Systematics: Approaches and PerspectivesCambridge University Press, Cambridge, Cambridge, pp. 281-298.
  • Vickaryous, Matthew K. (2006). "New information on the cranial anatomy of Edmontonia rugosidens Gilmore, a Late Cretaceous nodosaurid dinosaur from Dinosaur Provincial Park, Alberta". Journal of Vertebrate Paleontology 26 (4): 1011-1013. doi:10.1671/0272-4634(2006)26[1011:niotca]2.0.co;2. 
  • Bakker, R.T. (1988). Review of the Late Cretaceous nodosauroid Dinosauria: Denversaurus schlessmania new armor-plated dinosaur from the Latest Cretaceous of South Dakota, the last survivor of the nodosaurians, with comments on Stegosaur-Nodosaur relationships. Hunteria 1(3):1-23.(1988).
  • Coombs, W. P Jr.; Maryańska, T. (1990). "Ankylosauria." In Weishampel, D. P.; Dodson, P.; Osmólka, H., eds. The Dinosauria. University of California Press. pp. 456-483. 
  • Matthew, W. D. (1922). "A superdreadnaught of the animal world-the armoured dinosaur. Palaeoscincus". Natural History 22: 333-342. 
  • Gilmore, C.W. (1930). "On dinosaurian reptiles from the Two Medicine Formation of Montana". Proceedings of the United States National Museum 77 (16): 1-39. doi:10.5479/si.00963801.77-2839.1. 
  • Russell, L.S. (1940). "Edmontonia rugosidens (Gilmore), an armored dinosaur from the Belly River Series of Alberta". University of Toronto Studies, Geology Series 43: 3-28. 
  • Sternberg, C.M. (1928). "A new armored dinosaur from the Edmonton Formation of Alberta". Transactions of the Royal Society of Canada, series 3 22: 93-106. 
  • Arbour, V.M.Burns, M. E.; Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur. Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology 29 (4): 1117-1135. doi:10.1671/039.029.0405. 
  • Ford, T.L. (2000). A review of ankylosaur osteoderms from New Mexico and a preliminary review of ankylosaur armor. In: Lucas, S.G., and Heckert, A.B. (eds.). Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science Bulletin 17:157-176.
  • Carpenter K (2001). "Phylogenetic analysis of the Ankylosauria". In Carpenter, Kenneth(ed), ed. The Armored Dinosaurs. Indiana University Press. pp. 455-484. ISBN 0-253-33964-2. 
  • Vickaryous, M.K., Maryańska, T., and Weishampel, D.B., (2004). "Ankylosauria." In Weishampel, D. B., Dodson, P., and Osmólska, H. (eds.), ed. The Dinosauria (Second Edition). University of California Press. pp. 363-392. ISBN 0-520-24209-2. 
  • Etymology Chassternbergia courtesy of www.dinosaurnames.net
  • Currie P.J., Russell D.A., 2005, "The geographic and stratigraphic distribution of articulated and associated dinosaur remains", In: Currie P.J., Koppelhus E.B., (editors). Dinosaur Provincial Park: A spectacular ancient ecosystem revealed. Bloomington: Indiana University Press. pp 537-569.
  • Burns, Michael E. (2008). "Taxonomic utility of ankylosaur (Dinosauria, Ornithischia) osteoderms: Glyptodontopelta mimus Ford, 2000: a test case". Journal of Vertebrate Paleontology 28 (4): 1102-1109. 
  • Hunt, A.P. and Lucas, S.G., 1992, "Stratigraphy, Paleontology and age of the Fruitland and Kirkland Formations (Upper Cretaceous), San Juan Basin, New Mexico", New Mexico Geological Society Guidebook43rd Field Conference, San Juan Basin, volume 4, p. 217-240.
  • Carpenter, K.; DiCroce, T.; Kinneer, B.; Simon, R. (2013). "Pelvis of Gargoyleosaurus (Dinosauria: Ankylosauria) and the Origin and Evolution of the Ankylosaur Pelvis".. PLoS ONE 8 (11): e79887. PMC 3828194. PMID 24244573. doi:10.1371/journal.pone.0079887. 
  • Burns, ME. Intraspecific Variation in Late Cretaceous Nodosaurids (Ankylosauria: Dinosauria). Journal of Vertebrate Paleontology, Program and Abstracts, 2015, 99-100. ("Archived copy". Archived since the original November 6, 2015. Accessed October 30, 2015. )
  • Richard S. Thompson; Jolyon C. Parish; Susannah C. R. Maidment; Paul M. Barrett (2011). "Phylogeny of the ankylosaurian dinosaurs (Ornithischia: Thyreophora).". Journal of Systematic Palaeontology 10 (2): 301-312. doi:10.1080/14772019.2011.569091. 
  • Mallon, J. C., Evans, D. C., Ryan, M. J., & Anderson, J. S. (2012). Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology.
  • Eberth, D.A., 1997, "Edmonton group". In: Currie, P.J., Padian, K. (Eds.), Encyclopedia of Dinosaurs. Academic Press, New York, pp. 199-204.
  • Larson, Derek W.; Brinkman, Donald B.; Bell, Phil R. (2010). "Faunal assemblages from the upper Horseshoe Canyon Formation, an early Maastrichtian cool-climate assemblage from Alberta, with special reference to the Albertosaurus sarcophagus bonebed". Canadian Journal of Earth Sciences 47: 1159-1181. doi:10.1139/e10-005. 
geological time 3

Fun Facts

  • Edmontonia was a herbivore.
  • It reproduced by laying eggs.
  • It was bulky and tank-like and designed for protection.
  • It lived in the late Cretaceous period.
  • He walked on all fours.

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