What makes Struthiomimus scientifically significant?

Struthiomimus provides critical insights into the evolutionary radiation of Theropoda. Holotypes and fossil evidence indicate: Complete articulated skeletons in the American Museum of Natural History and Canadian Museum of Nature.

Struthiomimus (Struthiomimus altus Lambe, 1902) - Size, Diet & Cretaceous Period Facts

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Struthiomimus (Struthiomimus altus Lambe, 1902) - Size, Diet & Cretaceous Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Struthiomimus altus Lambe, 1902 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	Saurischia (Lizard-Hipped Dinosaurs)	Characterized ancestrally by a triradiate pelvis with an anteriorly pointing pubis.
Suborder	Theropoda	Bipedal saurischian dinosaurs, historically dominated by carnivores and including the avian lineage.
Genus	Struthiomimus	Monophyletic prehistoric clade
Species	Struthiomimus altus Lambe, 1902	Specific authority designation

Anatomy & Physical Characteristics

Struthiomimus ('ostrich mimic') was an abundant, highly specialized cursorial ornithomimid from the Dinosaur Park and Horseshoe Canyon Formations of Alberta, Canada. Measuring four meters long, its tibia was significantly longer than its femur, a classic adaptation for high-speed sustained running.

Its hands were unusually long and slender, equipped with three fingers bearing gently curved claws, suited for pulling down tree branches or raking through leaf litter.

Diagnostic Morphological Traits

Lightly constructed ostrich-like biped with large eyes, a toothless horny bill, and long-fingered hands.

Comparative Scale & Biometrics

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

Approx. 2.4× human length

Struthiomimus (Length)3.5–4.3 m (11.5–14.1 ft)

Adult Human1.8 m (6.0 ft)

Length

3.5–4.3 m (11.5–14.1 ft)

Height

1.4–1.6 m (4.6–5.2 ft)

Estimated Mass

150–200 kg (331–441 lbs)

Diet & Feeding Ecology

All Omnivore Species

Trophic Guild: Omnivore

Opportunistic omnivore feeding on seeds, buds, insects, fruits, and small vertebrates.

Paleobiology & Behavior

Slender, fast-running ornithomimid herbivore relying on acute stereoscopic vision and high-speed running to evade apex predators. In the Dinosaur Park ecosystem, Struthiomimus coexisted with hadrosaurs like Corythosaurus and was actively hunted by Albertosaurus.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Coastal floodplains, swamp forests, and low-lying coastal plains along the Western Interior Seaway.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Complete articulated skeletons in the American Museum of Natural History and Canadian Museum of Nature.

Discovery & Taxonomic Naming History

Year of Discovery / Description1901

Type Specimen Locality & FormationDinosaur Park Formation, Alberta, Canada

Collected by Lawrence Lambe; renamed Struthiomimus by Henry Fairfield Osborn in 1916.

Geological Era & Chronostratigraphy

Explore All Cretaceous Period Fauna

Cretaceous Period PeriodTemporal Interval: 76–66 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 Struthiomimus 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 Struthiomimus serves as a crucial benchmark in vertebrate paleontology, illustrating key adaptive radiations within Theropoda.

Phylogenetic Placement: Informs cladistic debates concerning the divergence, skull biomechanics, and skeletal evolution of Cretaceous Period fauna.
Paleoecological Guild: Documents trophic specialization (Omnivore) and predator-prey dynamics across its regional ecosystem.
Taphonomic Record: Complete articulated skeletons in the American Museum of Natural History and Canadian Museum of Nature.

Frequently Asked Questions About Struthiomimus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Struthiomimus live?

Struthiomimus lived during the Cretaceous Period Period, approximately 76–66 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Struthiomimus?

Paleontological estimates place Struthiomimus at a length of 3.5–4.3 m (11.5–14.1 ft), a hip/standing height of 1.4–1.6 m (4.6–5.2 ft), and a body mass of 150–200 kg (331–441 lbs).

Q3.What was the diet of Struthiomimus?

Classified as a omnivore, Struthiomimus specialized in consuming Opportunistic omnivore feeding on seeds, buds, insects, fruits, and small vertebrates..

Q4.Where were Struthiomimus fossils discovered?

Fossil specimens of Struthiomimus have been recovered from Dinosaur Park Formation, Alberta, Canada, with notable historic specimens documented in 1901. Collected by Lawrence Lambe; renamed Struthiomimus by Henry Fairfield Osborn in 1916.

Academic Literature & Peer-Reviewed References

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

Bulletin of the American Museum of Natural HistoryView Publication
Osborn, H. F. (1916). Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus. Bulletin of the American Museum of Natural History, 35(43), 733-771.
Curated & Verified: 2026-09-24

Struthiomimus

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