Genus

Valid Extinct

Edmontosaurus

Lambe 1917

Edmontosaurus, often colloquially and historically known as Anatosaurus or Anatotitan, is a genus of hadrosaurid (duck-billed) dinosaur. It contains two known species: Edmontosaurus regalis and Edmontosaurus annectens. Fossils of E. regalis have been found in rocks of western North America that date from the late Campanian age of the Cretaceous period 73 million years ago, while those of E. annectens were found in the same geographic region from rocks dated to the end of the Maastrichtian age, 66 million years ago. Edmontosaurus was one of the last non-avian dinosaurs ever to exist, and lived alongside dinosaurs like Triceratops, Tyrannosaurus, Ankylosaurus, and Pachycephalosaurus shortly before the Cretaceous–Paleogene extinction event.

Temporal range

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

252 201 145 66 0 Ma

PBDB occurrences

Group

Dinosaures

Herbivore Ground dwelling, gregarious Terrestrial

click to enlarge

Edmontosaurus in the Rocky Mountain Dinosaur Resource Center, Woodland Park, Colorado © MCDinosaurhunter · CC BY-SA 3.0 · Wikimedia

PBDB ↗ Wikipedia ↗

Classification

Dinosauria Unranked clade

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Ornithischia Unranked clade

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Neornithischia Unranked clade

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Pyrodontia Unranked clade

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Cerapoda Unranked clade

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Ornithopoda Suborder

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Iguanodontia Infraorder

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Euiguanodontia Unranked clade

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Dryomorpha Unranked clade

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Ankylopollexia Unranked clade

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Styracosterna Unranked clade

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Hadrosauriformes Unranked clade

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Hadrosauroidea Unranked clade

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Hadrosauridae Family

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Hadrosaurinae Subfamily

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Edmontosaurini Tribe

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Edmontosaurus Genus

Measurements

Length

11,5 m ⓘ

Edmontosaurus regalis — min connu

15 m ⓘ

Edmontosaurus annectens — max connu

13 m ⓘ

Mass

6 600 kg ⓘ

Edmontosaurus regalis — min connu

14 500 kg ⓘ

Edmontosaurus annectens — max connu

Fossil sites 85 geolocated sites

Distribution

Top countries

🇺🇸 United States

🇨🇦 Canada

Geological formations

Hell Creek

Lance

Horseshoe Canyon

St. Mary River

Laramie

Frenchman

Schrader Bluff

Marshalltown

Wapiti

Prince Creek

Temporal distribution

Maastrichtian (72.2–66 Ma)

Campanian (83.6–72.2 Ma)

Species (7)

Agathaumas milo subjective synonym of Edmontosaurus regalis 84 Ma

Anatosaurus copei subjective synonym of Edmontosaurus annectens 84 Ma

Edmontosaurus annectens 84 Ma

Edmontosaurus edmontoni subjective synonym of Edmontosaurus annectens 84 Ma

Edmontosaurus regalis 84 Ma

Edmontosaurus saskatchewanensis subjective synonym of Edmontosaurus annectens 84 Ma

Trachodon longiceps subjective synonym of Edmontosaurus annectens 84 Ma

Synonyms (2)

Anatosaurus subjective synonym of Edmontosaurus

Anatotitan subjective synonym of Edmontosaurus

News 6

Tyrannosaurus rex Scavenged Duck-Billed Dinosaurs in Ancient Wyoming, Bite Marks Reveal

bone feeding hunting United States Cretaceous +5

Thousands of fossilized bones from a Cretaceous-period bonebed in Wyoming, the United States, offer rare physical evidence that Tyrannosaurus rex fed on the carcasses of a duck-billed dinosaur species called Edmontosaurus annectens. The post Tyrannosaurus rex Scavenged Duck-Billed Dinosaurs in Ancient Wyoming, Bite Marks Reveal appeared first on Sci.News: Breaking Science News.

16/07/2026 sci-news

This dinosaur fossil captures the final moments of a T. rex attack

tooth predator prey fossil Dinosauria +4

A fossilized Edmontosaurus skull with a Tyrannosaurus tooth still embedded in its face has given scientists rare evidence of a dramatic predator-prey encounter. The discovery suggests the giant carnivore delivered an incredibly powerful face-to-face bite, offering new clues about how Tyrannosaurus hunted.

14/07/2026 sciencedaily

CollectA Deluxe Edmontosaurus Model Feeding on Some Conifers

feeding Cretaceous Late Cretaceous Dinosauria Edmontosaurus +1

Thank you Caldey for sending us a photograph of your CollectA Deluxe Edmontosaurus feeding in the garden. The dinosaur looks very much at home munching on some conifers. Palaeontologists know from hadrosaur stomach contents that these Late Cretaceous herbivores did feed on conifers. It is a delightfully composed photograph. The viewing angle gives the impression

23/06/2026 everythingdinosaur

Paleontology rocked by discovery of organic molecules in 66-million-year-old dinosaur bones

bone collagen protein fossil Dinosauria +2

Scientists have uncovered compelling evidence that dinosaur fossils may still contain traces of their original proteins, overturning a long-standing belief that fossilization destroys all organic material. In a remarkably well-preserved Edmontosaurus fossil from South Dakota, researchers detected remnants of collagen — the main protein found in bone — using advanced techniques including mass spectrometry and protein sequencing.

14/05/2026 sciencedaily

Dinosaur mummy found with hooves and a hidden crest

crest scale movie Dinosauria Edmontosaurus

Scientists have reconstructed the most complete and lifelike profile of Edmontosaurus annectens thanks to an extraordinary preservation process called clay templating, in which a thin clay film captured the dinosaur’s skin, scales, spikes, and even hooves in three dimensions. By combining newly excavated “mummies,” advanced imaging, and artistic reconstruction, researchers revealed a tall crest, a single row of tail spikes, delicate pebble-like scales, and—most remarkably—the earliest known hoov

30/11/2025 sciencedaily

Edmontosaurus: Beast of the Week

Cretaceous Late Cretaceous Canardia Dinosauria Edmontosaurus +1

Today we are checking out one of the largest and most well studied of the duck-billed dinosaurs. Enter Edmontosaurus! Edmontosaurus annectens in watercolors by Christopher DiPiazza.Edmontosaurus was a hadrosaur ("duck-billed") dinosaur that could grow to at least 39 feet (12 meters) long from beak to tail that lived during the late Cretaceous period in what is now western North America. There are currently two recognized species within the genus, Edmontosaurus regalis and Edmontosaurus annect

29/11/2025 prehistoricbeastoftheweek

Images 7

Bibliography

Original description

L. M. Lambe. 1917. A new genus and species of crestless hadrosaur from the Edmonton Formation of Alberta. The Ottawa Naturalist 31(7):65-73

Bibliography (51)

T. C. Wyenberg-Henzler and J. B. Scannella. 2026. Behavioral implications of an embedded tyrannosaurid tooth and associated tooth marks on an articulated skull of Edmontosaurus from the Hell Creek Formation, Montana. PeerJ 14(4443):e20796:1-32 DOI ↗

H. S. Sharpe, M. J. Powers, and A. D. Dyer, M. M. Rhodes, A. P. McIntosh, C. W. Garros, P. J. Currie, G. F. Funston. 2023. Craniomandibular anatomy of a juvenile specimen of Edmontosaurus regalis Lambe, 1917 clarifies issues in ontogeny and biogeography. Journal of Vertebrate Paleontology 43(5):e2326644:1-21 DOI ↗

C. Libke, P. R. Bell, and C. M. Somers, R. C. McKellar. 2022. New scale type from a small-bodied hadrosaur in the Frenchman Formation of southern Saskatchewan: potential implications for integumentary diversity in Edmontosaurus annectens. Cretaceous Research 136(105215) DOI ↗

W. W. Stein. 2021. The paleontology, geology and taphonomy of the Tooth Draw Deposit; Hell Creek Formation (Maastrictian), Butte County, South Dakota. The Journal of Paleontological Sciences JPS.C.21:0001:1-108

A. A. Farke and E. Yip. 2019. A juvenile cf. Edmontosaurus annectens (Ornithischia, Hadrosauridae) femur documents a previously unreported intermediate growth stage for this taxon. Vertebrate Anatomy Morphology Palaeontology 7:59-67 DOI ↗

W. W. Stein. 2019. Taking count: a census of dinosaur fossils recovered from the Hell Creek and Lance formations (Maastrichtian). The Journal of Paleontological Sciences JPS.C.2019:01:1-42

M. Wosik, M. B. Goodwin, and D. C. Evans. 2018. A nestling-sized skeleton of Edmontosaurus (Ornithischia, Hadrosauridae) from the Hell Creek Formation of northeastern Montana, U.S.A., with an analysis of ontogenetic limb allometry. Journal of Vertebrate Paleontology (e1398168):1-19 DOI ↗

P. V. Ullmann, A. Shaw, and R. Nellermoe, K. J. Lacovara. 2017. Taphonomy of the Standing Rock Hadrosaur Site, Corson County, South Dakota. Palaios 32:779-796 DOI ↗

D. C. Evans, D. A. Eberth, and M. J. Ryan. 2015. Hadrosaurid (Edmontosaurus) bonebeds from the Horseshoe Canyon Formation (Horsethief Member) at Drumheller, Alberta, Canada: geology, preliminary taphonomy, and significance. Canadian Journal of Earth Sciences 52:642-654 DOI ↗

P. J. Currie and E. B. Koppelhus. 2014. Implications of finding a ceratopsian horncore in the Danek bonebed. Canadian Journal of Earth Sciences 51:1034-1038 DOI ↗

T. S. Kelly. 2014. Preliminary report on the mammals form Lane's Little Jaw Site Quarry: a latest Cretaceous (earliest Puercan?) local fauna, Hell Creek Formation, southeastern Montana. Paludicola 10(1):50-91

A. Prieto-Márquez. 2014. A juvenile Edmontosaurus from the late Maastrichtian (Cretaceous) of North America: Implications for ontogeny and phylogenetic inference in saurolophine dinosaurs. Cretaceous Research 50:282-303 DOI ↗

F. Fanti, P. R. Bell, and R. L. Sissons. 2013. A diverse, high-latitude ichnofauna from the Late Cretaceous Wapiti Formation, Alberta, Canada. Cretaceous Research 41:256-269 DOI ↗

V. Vajda, T. R. Lyson, and A. Bercovici, J. H. Doman, D. A. Pearson. 2013. A snapshot into the terrestrial ecosystem of an exceptionally well- preserved dinosaur (Hadrosauridae) from the Upper Cretaceous of North Dakota, USA. Cretaceous Research 46:114-122 DOI ↗

A. R. Fiorillo. 2011. Microwear patterns on the teeth of northern high latitude hadrosaurs with comments on microwear patterns in hadrosaurs as a function of latitude and seasonal ecological constraints. Palaeontologia Electronica 14(3):20A:1-17

M. T. Carrano. 2005. Fossil Vertebrate Collections, University of California Museum of Paleontology

K. Carpenter and D. B. Young. 2002. Late Cretaceous dinosaurs from the Denver Basin, Colorado. Rocky Mountain Geology 37(2):237-254 DOI ↗

K. Carpenter. 2000. Evidence of predatory behavior by carnivorous dinosaurs. Gaia 15:135-144

M. J. Ryan and D. A. Eberth. 1995. Taphonomy of a hadrosaur (Ornithischia: Hadrosauridae) bone bed from the Horseshoe Canyon Formation (early Maastrichtian), Alberta, Canada. Journal of Vertebrate Paleontology 15(3, suppl.):51A

K. Carpenter and K. Alf. 1994. Global distribution of dinosaur eggs, nests, and babies. Dinosaur Eggs and Babies, Cambridge University Press, Cambridge

J. W. Hoganson, J. M. Campbell, and E. C. Murphy. 1994. Stratigraphy and paleontology of the Cretaceous Hell Creek Formation, Stumpf site, Morton County, North Dakota. Proceedings of the North Dakota Academy of Sciences 48:95

W. B. Gallagher. 1993. The Cretaceous/Tertiary mass extinction event in the North Atlantic coastal plain. The Mosasaur 5:75-154

J. R. Horner and D. Lessem. 1993. The Complete T. rex DOI ↗

D. A. Ein. 1992. A dinosaur by any other name. Lapidary Journal 46(8):24-28

E. Daeschler and A. R. Fiorillo. 1989. Rediscovery of fossil material at the Academy of Natural Sciences of Philadelphia from Edward Drinker Cope's 1893 expedition to the Dakotas. The Mosasaur 4:143-148

J.-G. Michard. 1986. Histoire de la découverte du spécimen d'Anatosaurus (Dinosaure, Hadrosauridé) vendu au Muséum d'Histoire Naturelle de Paris en 1911 [History of the discovery of a specimen of Anatosaurus (Dinosauria, Hadrosauridae) sold to the Museum of Natural History in Paris in 1911]. Annales de Paléontologie (Vert.-Invert.) 72(2):142-154

J. L. Whitmore and J. E. Martin. 1986. Vertebrate fossils from the Greasewood Creek locality in the Late Cretaceous Lance Formation of Niobrara County, Wyoming. Proceedings of the South Dakota Academy of Sciences 65:33-50

D. H. Tanke. 1984. Dinosaurs of the Devon area with reference to a large hadrosaur femur. Fossils Quarterly 3(2):19-30

D. B. Weishampel and J. B. Weishampel. 1983. Annotated localities of ornithopod dinosaurs: implications to Mesozoic paleobiogeography. The Mosasaur 1:43-87

J. S. McIntosh. 1981. Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of the Carnegie Museum of Natural History. Bulletin of Carnegie Museum of Natural History 18:1-67 DOI ↗

P. J. Currie. 1980. Mesozoic vertebrate life in Alberta and British Columbia. Mesozoic Vertebrate Life 1:27-40

C. Lupton, D. Gabriel, and R. M. West. 1980. Paleobiology and depositional setting of a Late Cretaceous vertebrate locality, Hell Creek Formation, McCone County, Montana. Contributions to Geology, University of Wyoming 18(2):117-126

D. Baird. 1979. The dome-headed dinosaur Tylosteus ornatus Leidy 1872 (Reptilia: Ornithischia: Pachycephalosauridae). Notulae Naturae 456:1-11

W. Langston. 1975. The ceratopsian dinosaurs and associated lower vertebrates from the St. Mary River Formation (Maestrichtian) at Scabby Butte, southern Alberta. Canadian Journal of Earth Sciences 12:1576-1608 DOI ↗

M. T. Greenwald. 1971. The Lower Vertebrates of the Hell Creek Formation, Harding County, South Dakota.

W. J. Morris. 1970. Hadrosaurian dinosaur bills—morphology and function. Los Angeles County Museum Contributions in Science 193:1-14 DOI ↗

R. Estes, P. Berberian, and C. A. M. Meszoely. 1969. Lower vertebrates from the Late Cretaceous Hell Creek Formation, McCone County, Montana. Breviora 337:1-33

L. S. Russell. 1966. Dinosaur hunting in western Canada. Royal Ontario Museum, Life Sciences Contribution 70:1-37 DOI ↗

R. Estes. 1964. Fossil vertebrates from the Late Cretaceous Lance Formation, eastern Wyoming. University of California Publications in Geological Sciences 49:1-187

W. L. Rohrer and R. Konizeski. 1960. On the occurrence of Edmontosaurus in the Hell Creek formation of Montana. Journal of Paleontology 34(3):464-466

W. E. Swinton. 1950. The Canadian dinosaur. The Illustrated London News 217(5814):490

R. S. Lull and N. E. Wright. 1942. Hadrosaurian dinosaurs of North America. Geological Society of America Special Paper 40:1-242 DOI ↗

F. Drevermann. 1928. “Totenmasken” aus der Urzeit [“Death masks” from ancient times]. Bericht der Senckenbergischen Naturforschen Gesellschaft 53:199-205

C. M. Sternberg. 1926. A new species of Thespesius from the Lance Formation of Saskatchewan. Canada Department of Mines Geological Survey Bulletin (Geological Series) 44(46):73-84 DOI ↗

C. W. Gilmore. 1924. A new species of hadrosaurian dinosaur from the Edmonton Formation (Cretaceous) of Alberta. Canada Department of Mines Geological Survey Bulletin (Geological Series) 38(43):13-26 DOI ↗

L. M. Lambe. 1917. A new genus and species of crestless hadrosaur from the Edmonton Formation of Alberta. The Ottawa Naturalist 31(7):65-73

H. F. Osborn. 1911. A dinosaur mummy. The American Museum Journal 11(1):6-11

J. B. Hatcher, O. C. Marsh, and R. S. Lull. 1907. The Ceratopsia. Monographs of the United States Geological Survey 49:1-198 DOI ↗

C. E. Beecher. 1902. The reconstruction of a Cretaceous dinosaur, Claosaurus annectens Marsh. Transactions of the Connecticut Academy of Arts and Sciences 11:311-324

O. C. Marsh. 1892. Notice of new reptiles from the Laramie Formation. American Journal of Science 43:449-453 DOI ↗

E. D. Cope. 1874. Report on the stratigraphy and Pliocene vertebrate paleontology of northern Colorado. Bulletin of the United States Geological and Geographical Survey of the Territories 1(1):9-22

Edmontosaurus

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