Body length
InferredAbout 4 m; genus museum reference
NHM gives this rounded genus value without identifying a specimen, species or life stage. [D1]
EXHIBIT 33
Ornithomimus
Ornithomimus
A “bird mimic” with fossil evidence of feathers.
TWO WAYS TO PICTURE THE PAST
Science & the silver screen
Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.
01 / SCIENTIFIC RECONSTRUCTION
An animal, reconstructed
Image unavailableOrnithomimus life reconstruction by Stegotyranno. Ostrichlike flightless biped with long legs and balancing tail; show downy body and adult feathered forearms, following O. edmontonicus evidence.This scientific picture needs an internet connection. Its source link and image notes remain available.
The artist identifies this reconstruction as Ornithomimus. Fossil-informed anatomy: Ostrichlike flightless biped with long legs and balancing tail; show downy body and adult feathered forearms, following O. edmontonicus evidence. The file page identifies the genus only. Colour, feather arrangement and soft-tissue contours are artistic reconstruction; no accuracy warning appears on the read page. [1] [2]
Ornithomimus based on Scott Hartman skeletal.jpg — Stegotyranno. CC BY-SA 4.0. Remote source artwork displayed without additional cropping; Wikimedia supplies any display-size derivative.
Scientific picture served by Wikimedia · internet connection required.
02 / MOVIE-STYLE INTERPRETATION
A cinematic imagination
Image unavailableOriginal cinematic Ornithomimus picture: Cinematic adult Ornithomimus with long-legged running proportions, downy covering and feathered forearms; poised birdlike stance with balancing tail in soft floodplain light.The exhibit and its image notes remain available.
Cinematic adult Ornithomimus with long-legged running proportions, downy covering and feathered forearms; poised birdlike stance with balancing tail in soft floodplain light. Dramatic lighting, surface detail and scenery are artistic choices. This is an original cinema-inspired picture, rather than a frame from a film or a documented fossil locality.
Original artwork · artistic interpretation.
Scientific view: credited paleoart interpreting fossil evidence, served online by Wikimedia. Movie-style view: Original artistic interpretation. Colors, soft tissues and settings involve reconstruction.
PERIODLate Cretaceous[1]
DIETOmnivoreInferred from related anatomy [1]
TOTAL LENGTHNot established hereComparable estimate unavailable
FOSSILS FOUNDCanada, USA[1]
MEET THE ANIMAL
Meet Ornithomimus
Ornithomimus was an ostrich-like dinosaur, and a fossil from the Late Cretaceous Dinosaur Park Formation of Alberta shows just how bird-like its covering could be. Researchers reported preserved feathers on its body and tail together with patches of skin. This combination provides information that a skeleton alone cannot give, because the animal's outer surface rarely survives fossilization. [S1]
The fossil showed bare skin from around the middle of the thigh down the leg, as well as a skin web between the thigh and abdomen. Feathers covered other regions. Comparing this arrangement with ostriches, the researchers proposed that Ornithomimus could have used feathered and bare areas to help control body temperature. The resemblance supports an interpretation, rather than a direct measurement of its temperature. [S1]
Although burial had crushed the feathers, powerful microscopy revealed their surviving three-dimensional structure. That makes the specimen more than an outline of a fuzzy dinosaur: it preserves physical evidence of its covering. Ornithomimus helps show how traits familiar in living birds already existed in their dinosaur relatives, while its exact daily routines remain beyond what this fossil records. [S1]
Overview sources
- Prehistoric plumage patternsUniversity of Alberta Faculty of Science · Accessed 2026-10-04Inspected: page
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
Ornithomimus was a North American ornithomimid, and specimens assigned to O. edmontonicus preserve filamentous feathers. Adult forelimb feather structures provide evidence relevant to the evolution of wings before powered flight in this lineage.
Profile scope: Genus: Ornithomimus; feather and adult-function interpretations concern O. edmontonicus.
- Time
- Late Cretaceous
- Fossil locations in this exhibit
- Canada, USA
How to read the evidence
Source supported identifies a description documented by the cited source. Inferred marks a reconstruction or functional estimate. Debated marks competing interpretations. Not established means the sources reviewed for this dossier do not support a firm conclusion; it does not mean a behavior never occurred.
A size reference is an estimate, not a population range. Nesting evidence does not by itself establish courtship, mate choice, or lifelong pairing.
Body mass
InferredAbout 160 kg; O. edmontonicus reference
Berkeley's adult O. edmontonicus account gives about 350 pounds, approximately 160 kg. This is a rounded reference estimate, not a genus-wide mass range. [D3]
Diet
InferredOmnivory proposed
NHM lists the genus as omnivorous. The reviewed material does not demonstrate a particular mix of foods through gut contents. [D1]
Habitat & fossil setting
Source supportedNorth America; river-deposit feather specimens
NHM records Canada and the USA; the feather account reports river-associated deposits for O. edmontonicus. Burial setting is not an exclusive habitat preference. [D1] [D3]
Movement
Source supportedBipedal and flightless
Berkeley describes the ostrich-like, flightless skeleton of O. edmontonicus. Winglike arm feathers do not establish flight. [D3]
Distinctive anatomy
Source supportedFilamentous plumage; adult winglike forelimb structures
The study describes filamentous feathers at different growth stages and winglike forelimb structures in adults. These observations are specimen evidence, not a complete record of all species. [D2]
Reproduction & life together
Reproduction & nesting
InferredAdult feathers may relate to reproduction
Adult-specific feather structures led researchers to propose reproductive functions, such as brooding or signaling. This is not a preserved Ornithomimus nest or proof of a parenting system. [D2] [D3]
Courtship & mating
InferredFeather display possible; sequence unknown
Adult forelimb feathers have been interpreted as possible mate-attraction structures. Actual displays, sex differences and pair bonds remain unestablished. [D3]
Social behavior
Not establishedNot established here
The reviewed sources do not establish a taxon-specific group structure or social hierarchy.
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- Ornithomimus — Dino DirectoryNatural History Museum, London · Accessed 2026-10-02Museum genus reference; life stage and specimen not specified. · Inspected: page
- Feathered non-avian dinosaurs from North America provide insight into wing originsScience; Zelenitsky et al. (2012), abstract via PubMed · Accessed 2026-10-02Original feather study; life-stage differences and reproductive-function hypothesis. · Inspected: abstract
- A new look at dinosaur fossils pushes back the evolution of feathered wingsUniversity of California Museum of Paleontology, Berkeley · Accessed 2026-10-02Species O. edmontonicus; flightlessness, approximate mass and river-deposit feather fossils. · Inspected: page
THE STORY IN THE FOSSILS
Meet Ornithomimus.
Ornithomimus belongs to the ornithomimid branch of theropods and is recorded from Canada and the United States. Its ostrichlike skeleton gave it the name bird mimic. Museum profiles describe an omnivorous diet, but feather fossils provide its most distinctive evidence about living appearance. [1] [2]
A juvenile Ornithomimus edmontonicus preserved downy filaments, while an adult specimen showed traces of feathers with central shafts. Because this dinosaur was flightless, researchers proposed an adult role such as display or brooding. The finding broadened evidence for complex feathers among dinosaur lineages. [2]
A note on scale and time
We have not established a comparable adult total-length estimate for this taxon in this draft. Specimen measurements in the text describe those individuals. The cited dates are approximately 74–66 million years ago. Approximate museum catalogue reference interval for the genus, not an exact duration for every species. Unknown does not mean zero.
Sources & editorial notes
Sources and evidence notes for this exhibit.
- Ornithomimus — Dino DirectoryNatural History Museum, London · Accessed 2026-10-02Profile and Taxonomic details. Genus covers Canada and USA; 4 m lacks adult scope.
- A new look at dinosaur fossils pushes back the evolution of feathered wingsUniversity of California Museum of Paleontology, Berkeley · Accessed 2026-10-02November 2012 report, paragraphs on juvenile down and adult shafted feathers in Ornithomimus edmontonicus; proposed adult display or brooding function. Adult species mass is not transferred into a genus adult range.
KEEP EXPLORING
More from the collection
Image unavailableFull-body movie-style Gallimimus in a dramatic prehistoric landscape; Original artwork.The exhibit and its image notes remain available.
Gallimimus
Gallimimus
An ostrichlike runner with a toothless, ducklike beak.
OmnivoreMeet this dinosaur
Image unavailableFull-body movie-style Deinocheirus in a dramatic prehistoric landscape; Original artwork.The exhibit and its image notes remain available.
Deinocheirus
Deinocheirus
The mystery arms belonged to a humped, broad-beaked giant.
OmnivoreMeet this dinosaur
Image unavailableFull-body movie-style Citipati in a dramatic prehistoric landscape; Original artwork.The exhibit and its image notes remain available.