Cretaceous Omnivore Theropods

Gallimimus bullatus

Gallimimus bullatus

Pronunciation: [GAL-ih-MY-mus bul-AY-tus] Meaning: “Chicken mimic with capsule”

A fleet-footed ostrich-mimic theropod with a toothless keratinous beak suited for omnivorous grazing on vegetation, seeds, and small wetland invertebrates.

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Fossil skeleton cast mount of the ornithomimid dinosaur Gallimimus bullatus (based on holotype ZPAL MgD-I/1) displayed at the Natural History Museum, London.
Verified Museum Specimen
ZPAL MgD-I/1 cast mount • Natural History Museum, London, United Kingdom / Polish Academy of Sciences
Photo: Conty (CC BY 3.0) (CC BY 3.0) • Specimen Record ↗

Specimen Field Matrix

Empirical morphological and stratigraphical records
Geologic Period Cretaceous
Temporal Range Late Cretaceous, 70 Ma
Dietary Guild Omnivore
Taxonomic Clade Theropods
Total Length 6 m (19.7 ft)
Standing Height 2 m (6.6 ft)
Body Mass Estimate 450 kg (0.5 t / 992 lbs)
Locomotion Bipedal
Fossil Localities Mongolia (Nemegt Basin)
Stratigraphic Formations Nemegt Formation
Field Dispatch & Natural History

Paleontological Overview

A fleet-footed ostrich-mimic theropod with a toothless keratinous beak suited for omnivorous grazing on vegetation, seeds, and small wetland invertebrates.

Gallimimus bullatus was described from fossil material recovered in the Nemegt Formation.

Biomechanical Proportions

Human Scale Comparison

Proportional anatomical comparison between an average adult human (1.8 m / 5.9 ft) and Gallimimus bullatus (6 m / 19.7 ft length, 2 m / 6.6 ft standing height).

Ground Level (0.0 m) 1.8 m (5.9 ft) Length: 6 m (19.7 ft) 2 m height
Adult Human: 1.8 m (5.9 ft)
Gallimimus bullatus: 6 m (19.7 ft) length • 2 m (6.6 ft) standing height
Paleogeography & Stratigraphy

Where & When It Lived

Geographic Range & Habitat

Asia
Fossil Deposit Localities:
Mongolia (Nemegt Basin)
Geological Formations:
Nemegt Formation

Fossil specimens of this species have been recovered from terrestrial floodplains, ancient river channels, and coastal sandstone facies deposited during continental rifting and tectonic reconfigurations.

Geologic Epoch & Chronology

Cretaceous Period Late Cretaceous, 70 Ma

Radiometric dating of volcanic ash layers (bentonite horizons) places this taxon between 71 and 69 million years before the present.

Visual Archives

Specimen & Life Restoration Gallery

Verified Museum Specimen ZPAL MgD-I/1 cast mount
Biomechanical Profile Natural History Museum, London, United Kingdom / Polish Academy of Sciences
Scientific Bibliography

Peer-Reviewed References & Institutional Literature

Monographs and peer-reviewed taxonomic papers for this record are compiled from international paleontological journals and museum collections.

Scientific data peer-reviewed and verified on March 25, 2026 • Dinosaurs Facts Paleontological Registry
Mesozoic Kinship

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