EXPLORE PREHISTORY 220 prehistoric animal profiles · Scientific & movie-style image galleries

EXHIBIT 28

Oviraptor

Oviraptor

An “egg thief” whose nest association tells a different story.

Evidence profile
PERIODLate Cretaceous[1]
DIETNot established here
TOTAL LENGTHNot established hereComparable estimate unavailable
FOSSILS FOUNDMongolia[1]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Oviraptor

Oviraptor first became known from fossils collected in Mongolia. Its original description recorded an unusually short, toothless skull and an arm found with it. The skull lay close above a nest of eggs. These details made the discovery memorable, but they also encouraged an early interpretation that the animal had been caught taking another dinosaur's eggs. [S1]

Its name reflects that egg-stealing idea. The nest was initially attributed to Protoceratops, which was common at the site. Later discoveries changed how scientists understood these eggs: an embryo in the same kind of egg belonged to an Oviraptor-like dinosaur. That evidence made an association with the animal's own kind much more plausible than the original theft story. [S2]

The distinction matters because Oviraptor-like does not automatically mean the genus Oviraptor itself. Related dinosaurs supply useful comparisons, but their fossils should keep their own identities. An egg beside a skeleton also cannot, on its own, reveal a complete diet. Oviraptor's story shows why names and familiar reconstructions can outlast the scientific ideas that first inspired them. [S2]

Overview sources
  1. Three new Theropoda, Protoceratops zone, central MongoliaAmerican Museum Novitates; Osborn (1924), original paper indexed through CORE · Accessed 2026-10-04Inspected: excerpt
  2. Dinosaur EggsAmerican Museum of Natural History · Accessed 2026-10-04Inspected: page

PREHISTORIC ANIMAL DOSSIER

A life in profile.

The animal, the evidence, and the questions still open.

Oviraptor was a small beaked theropod from Late Cretaceous Mongolia. Its name arose from a mistaken egg-theft interpretation; later work on related oviraptorids changed the explanation of its association with a nest.

Profile scope: Genus: Oviraptor; comparisons concern O. philoceratops, with Citipati kept separate.

Time
Late Cretaceous
Fossil locations in this exhibit
Mongolia
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 length

Inferred

About 2 m; museum reference

NHM's rounded genus figure is not a specimen measurement or a complete biological range. [D1]

Body mass

Inferred

About 20 kg; museum estimate

NHM provides this reference value without identifying the specimen, growth stage or calculation method. [D1]

Diet

Inferred

Possible omnivore; exact foods uncertain

NHM classifies Oviraptor as omnivorous and discusses several possible foods. Its name and nest association do not demonstrate habitual egg eating. [D1] [D2]

Habitat & fossil setting

Source supported

Late Cretaceous Mongolia

The museum locates its fossils in Mongolia. These sources do not establish one preferred habitat across the genus. [D1]

Movement

Source supported

Walked on two legs

NHM identifies bipedal movement. Speed and detailed foraging behavior are not established here. [D1]

Distinctive anatomy

Source supported

Beaked jaws; relatively elongated snout

NHM identifies a toothless beak, while CT comparison documents a more elongated snout and lower jaw than in other oviraptorids. A famous crested skeleton formerly referred to Oviraptor was rejected as this genus. [D1] [D3]

Reproduction & life together

Reproduction & nesting

Inferred

Nest association suggests brooding

AMNH interprets the original Oviraptor association as tending its own eggs. Direct brooding poses described for Citipati remain evidence for that related genus and are not interchangeable specimens. [D2]

Courtship & mating

Not established

Not established here

The reviewed sources do not establish a mating ritual, pair bond or breeding season for this taxon.

Social behavior

Not established

Not 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.

  1. Oviraptor — Dino DirectoryNatural History Museum, London · Accessed 2026-10-02Museum genus reference; life stage and specimen not specified. · Inspected: page
  2. Fossil Hunting: Great DiscoveriesAmerican Museum of Natural History · Accessed 2026-10-02Museum account distinguishing nesting Citipati and the earlier Oviraptor nest interpretation. · Inspected: page
  3. Citipati osmolskae — expert CT annotationUniversity of Texas DigiMorph; Clark, Norell & Rowe (2002) · Accessed 2026-10-02C. osmolskae holotype skull; comparison with O. philoceratops and rejected older referral. · Inspected: page

THE STORY IN THE FOSSILS

Meet Oviraptor.

Oviraptor’s toothless jaws formed a beak rather than a row of cutting teeth. Curved jaw bones suggest an ability to handle hard food, but proposed diets differ. Museum interpretations include plants, small animals and shellfish; none supplies a secure menu for this particular genus. [1] [2]

The first Oviraptor was discovered with eggs thought to belong to Protoceratops, prompting its egg-thief name. An oviraptorid embryo later found in similar eggs changed that interpretation. The association came to be understood as parental care rather than evidence that the dinosaur was robbing a nest. [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 85–75 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.

  1. Oviraptor — Dino DirectoryNatural History Museum, London · Accessed 2026-10-02Profile and Taxonomic details. Listed omnivory is a museum interpretation; 2 m/20 kg have unspecified life stage.
  2. Oviraptor philoceratops — OLogy Card 019American Museum of Natural History · Accessed 2026-10-02Opening, Stats, Who Are You Calling an Egg Thief? and Stumper. Diet is explicitly unknown. Crest description reflects an educational reconstruction and requires caution.
  3. Citipati osmolskae — expert CT annotation from Clark, Norell and Rowe (2002)DigiMorph, University of Texas at Austin · Accessed 2026-10-02Expert annotation, paragraphs quoted from the original cranial paper, especially poorly preserved Oviraptor holotype, elongated rostrum/dentary and reassignment of IGM 100/42. Skull record is species-specific.

FOLLOW YOUR CURIOSITY

Who will you meet next?

KEEP EXPLORING

More from the collection