What makes Edmontosaurus scientifically significant?

Edmontosaurus provides critical insights into the evolutionary radiation of Ornithopoda. Holotypes and fossil evidence indicate: Multiple complete mummies preserving soft tissue, skin impressions, foot pads, and stomach contents.

Edmontosaurus (Edmontosaurus regalis Lambe, 1917) - Size, Diet & Cretaceous Period Facts

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Edmontosaurus (Edmontosaurus regalis Lambe, 1917) - Size, Diet & Cretaceous Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Edmontosaurus regalis Lambe, 1917 based on peer-reviewed cladistic analyses of diagnostic skeletal synapomorphies.

Taxonomic Rank	Taxon / Clade	Diagnostic Context
Kingdom	Animalia	Monophyletic prehistoric clade
Phylum	Chordata	Monophyletic prehistoric clade
Clade	Dinosauria	Monophyletic prehistoric clade
Order	Ornithischia (Bird-Hipped Dinosaurs)	Characterized by a pelvis with a backwards-pointing pubis parallel to the ischium.
Suborder	Ornithopoda	Beaked, bipedal and facultatively quadrupedal herbivores with complex multi-layered dental batteries.
Genus	Edmontosaurus	Monophyletic prehistoric clade
Species	Edmontosaurus regalis Lambe, 1917	Specific authority designation

Anatomy & Physical Characteristics

Edmontosaurus was one of the largest and most successful hadrosaurid dinosaurs in Earth's history, with some specimens (such as E. annectens 'X-rex') reaching estimated lengths exceeding 13 meters and weights up to nine tons. Known from incredible 'dinosaur mummies' with fossilized skin, it possessed a wide, broad duck-like beak.

In 2013, a spectacularly preserved Canadian specimen revealed a fleshy, hornless cranial comb on its head, similar to the cockscomb of modern roosters, confirming soft-tissue display structures in hadrosaurs.

Diagnostic Morphological Traits

Colossal facultative biped with a broad duck-like bill, hoof-like forefeet, fleshy cockscomb crest, and pebbled skin.

Comparative Scale & Biometrics

Anatomical dimensions relative to an average adult human (1.8 m / 6 ft tall)

Approx. 7.5× human length

Edmontosaurus (Length)11–13.5 m (36.1–44.3 ft)

Adult Human1.8 m (6.0 ft)

Length

11–13.5 m (36.1–44.3 ft)

Height

3.5–4.5 m (11.5–14.8 ft)

Estimated Mass

4.0–8.5 metric tons (8,818–18,739 lbs)

Diet & Feeding Ecology

All Herbivore Species

Trophic Guild: Herbivore

Horsetails, conifers, flowering plant leaves, and seeds ground with dental batteries of over 1,000 teeth.

Paleobiology & Behavior

Abundant duck-billed hadrosaur traveling in extensive migratory herds across western North America. In both the Horseshoe Canyon and Hell Creek Formations, Edmontosaurus was a primary food source for apex predators like Tyrannosaurus rex, while sharing lowland floodplains with Triceratops.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Extensive coastal lowlands, swamps, broad river valleys, and coastal delta plains.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Multiple complete mummies preserving soft tissue, skin impressions, foot pads, and stomach contents.

Discovery & Taxonomic Naming History

Year of Discovery / Description1892

Type Specimen Locality & FormationHorseshoe Canyon Formation, Alberta, Canada

Named by Lawrence Lambe in 1917; famous mummies discovered by Charles H. Sternberg in 1908.

Geological Era & Chronostratigraphy

Explore All Cretaceous Period Fauna

Cretaceous Period PeriodTemporal Interval: 73–66 Ma (million years ago)

The longest and final period of the Mesozoic Era, characterized by the rise of flowering plants, ceratopsians, hadrosaurs, tyrannosaurids, and concluding with the Chicxulub asteroid impact.

Where It Lived & Paleoenvironment

North America Dinosaurs

During the Mesozoic Era, continental drift progressively reconfigured land bridges, atmospheric currents, and regional precipitation regimes. Fossils of Edmontosaurus evidence its adaptation to the paleoenvironments of North America.

Paleogeographic RealmNorth America (North America)

Home to the fossil-rich Morrison Formation of the Late Jurassic and the Hell Creek and Dinosaur Park Formations of the Late Cretaceous.

Fossil Discovery Locality

Scientific Significance & Evolutionary Impact

The anatomical architecture of Edmontosaurus serves as a crucial benchmark in vertebrate paleontology, illustrating key adaptive radiations within Ornithopoda.

Phylogenetic Placement: Informs cladistic debates concerning the divergence, skull biomechanics, and skeletal evolution of Cretaceous Period fauna.
Paleoecological Guild: Documents trophic specialization (Herbivore) and predator-prey dynamics across its regional ecosystem.
Taphonomic Record: Multiple complete mummies preserving soft tissue, skin impressions, foot pads, and stomach contents.

Frequently Asked Questions About Edmontosaurus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Edmontosaurus live?

Edmontosaurus lived during the Cretaceous Period Period, approximately 73–66 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Edmontosaurus?

Paleontological estimates place Edmontosaurus at a length of 11–13.5 m (36.1–44.3 ft), a hip/standing height of 3.5–4.5 m (11.5–14.8 ft), and a body mass of 4.0–8.5 metric tons (8,818–18,739 lbs).

Q3.What was the diet of Edmontosaurus?

Classified as a herbivore, Edmontosaurus specialized in consuming Horsetails, conifers, flowering plant leaves, and seeds ground with dental batteries of over 1,000 teeth..

Q4.Where were Edmontosaurus fossils discovered?

Fossil specimens of Edmontosaurus have been recovered from Horseshoe Canyon Formation, Alberta, Canada, with notable historic specimens documented in 1892. Named by Lawrence Lambe in 1917; famous mummies discovered by Charles H. Sternberg in 1908.

Academic Literature & Peer-Reviewed References

Authoritative citations establishing the factual taxonomy, biometrics, and anatomy of Edmontosaurus.

PLoS ONEView Publication
Campione, N. E., & Evans, D. C. (2011). Cranial growth and variation in edmontosaurs (Dinosauria: Hadrosauridae): implications for latest Cretaceous megaherbivore diversity in North America. PLoS ONE, 6(9), e25186. https://doi.org/10.1371/journal.pone.0025186
Curated & Verified: 2026-09-24
The Ottawa Naturalist

Edmontosaurus

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