Oviraptor was a small to medium sized theropod dinosaur that lived in Asia during the Late Cretaceous Period, about 75 million years ago. It is famous because early fossil discoveries placed it near eggs, leading scientists to think it had been stealing them. Later evidence showed that many oviraptorosaurs likely guarded and brooded their own nests.
This makes Oviraptor an important example of how scientific ideas change when new fossil evidence is found.
Key Facts
- Oviraptor lived about 75 million years ago during the Late Cretaceous Period.
- Oviraptor was a theropod, the same broad dinosaur group that includes tyrannosaurs and modern birds.
- Many oviraptorosaurs had feathers, and Oviraptor is usually reconstructed with a feathered body and winglike forelimbs.
- Fossil nests show eggs arranged in rings, suggesting adult oviraptorosaurs may have crouched over the center to protect or warm them.
- Speed = distance / time, which can be used to estimate movement from trackways when distance and time are known.
- Relative age can be inferred by the law of superposition: in undisturbed rock layers, lower layers are older than upper layers.
Vocabulary
- Oviraptor
- Oviraptor is a Late Cretaceous theropod dinosaur from Asia known for its beaked skull and association with fossil nests.
- Theropod
- A theropod is a mainly meat eating or omnivorous dinosaur from a group that walked on two legs and gave rise to birds.
- Brooding
- Brooding is the behavior of sitting over eggs to protect them or help control their temperature.
- Cretaceous Period
- The Cretaceous Period was the last period of the Mesozoic Era, lasting from about 145 million to 66 million years ago.
- Fossil evidence
- Fossil evidence is preserved material or traces from ancient organisms that scientists use to reconstruct past life.
Common Mistakes to Avoid
- Calling Oviraptor only an egg thief is wrong because the original interpretation was based on limited evidence, and later nest fossils support parental care in related species.
- Drawing Oviraptor as a scaly lizard with no feathers is misleading because many close relatives show strong evidence of feathered bodies.
- Assuming every fossil near eggs proves predation is wrong because an adult found near a nest may have been guarding, brooding, or buried during a nesting event.
- Treating one fossil as complete proof of behavior is a mistake because paleontologists compare many specimens, rock layers, and related species before making conclusions.
Practice Questions
- 1 An Oviraptor fossil is dated to 75 million years ago. If the Cretaceous ended 66 million years ago, how many million years before the end of the Cretaceous did this Oviraptor live?
- 2 A nest contains 24 eggs arranged evenly in 3 rings. How many eggs are in each ring if the eggs are divided equally?
- 3 A fossil adult is found crouched over a ring of eggs. Explain why this evidence may support parental care rather than egg stealing.