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172 / Mesozoic
Mononykus
Mononykus olecranus
Each tiny forearm ended in one stout main claw, perhaps used to tear open insect nests like a modern anteater.
Structured expansion · editorial review pending
- Time range
- About 70 million years ago
- Final stage
- Late Cretaceous
- Geographic range
- Semiarid dunes and river valleys of Mongolia
01 / ANSWER FIRST
What was Mononykus?
This archive records Mononykus under the scientific name Mononykus olecranus, with an age of About 70 million years ago and a range of Semiarid dunes and river valleys of Mongolia. Each tiny forearm ended in one stout main claw, perhaps used to tear open insect nests like a modern anteater.
Mononykus was a light alvarezsaurid with long running legs and a narrow snout. Feathers probably covered the body, while a reinforced chest and elbow concentrated force into the single claw.
02 / QUICK FACTS
Mononykus at a glance
- Scientific name
- Mononykus olecranus
- Age
- About 70 million years ago
- Last recorded stage
- Late Cretaceous
- Known range
- Semiarid dunes and river valleys of Mongolia
- Broad group
- dinosaur
- Archive era
- Mesozoic
- Habitat signals
- vegetation, prey communities, floodplains and regional climate
- Documented regions
- Asia
03 / ANATOMY
How was Mononykus built?
Overall body plan
Each tiny forearm ended in one stout main claw, perhaps used to tear open insect nests like a modern anteater.
Skull, teeth and display structures
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Mononykus, those observations must be separated from features added only for visual reconstruction.
Limbs, balance and locomotion
Mononykus was a light alvarezsaurid with long running legs and a narrow snout. Feathers probably covered the body, while a reinforced chest and elbow concentrated force into the single claw.
Growth and individual variation
A single specimen does not define the whole species. Size, maturity, preservation and possible sex differences are considered before anatomical traits are treated as typical of Mononykus.
04 / DIET & BEHAVIOUR
How did Mononykus live?
Mononykus was a light alvarezsaurid with long running legs and a narrow snout. Feathers probably covered the body, while a reinforced chest and elbow concentrated force into the single claw. This ecological reconstruction is strongest where anatomy, associated organisms and the depositional setting point in the same direction.
05 / DIET & BEHAVIOUR
What shaped its ecological limits?
Its populations depended on vegetation, prey communities, floodplains and regional climate. Changes in any one factor did not necessarily cause immediate extinction, but interacting pressures could reduce range, recruitment and resilience.
06 / RANGE & HABITAT
Where and when did Mononykus live?
This archive currently lists About 70 million years ago; Semiarid dunes and river valleys of Mongolia. Fossil or historical occurrence data describe where evidence has been found, not every place the taxon once occupied. Species-level age and range limits still require source-specific review.
Documented geographic range
Semiarid dunes and river valleys of Mongolia. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 70 million years ago, with the final recorded stage listed as Late Cretaceous. Rock units and dating uncertainty mean the true biological range may extend beyond the known record.
Environmental setting
The archive uses the broad habitat labels vegetation, prey communities, floodplains and regional climate. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Mononykus?
Primary record
A partial Nemegt skeleton preserves the unique forelimb, chest, hindlimbs and tail; relatives fill gaps in skull and feather anatomy.
Comparative anatomy
Preserved structures are compared with close and functionally similar organisms. The method can constrain posture and function, but analogy alone cannot prove colour, behaviour or soft tissue.
Age and locality
Stratigraphy and occurrence records place Mononykus within About 70 million years ago and Semiarid dunes and river valleys of Mongolia. Reworked fossils and uncertain provenance are treated cautiously.
Open entity records
Links below connect the archive to available taxonomic and occurrence records. A matching name does not verify every ecological claim, and related-taxon links provide comparison rather than an exact species match.
08 / DISAPPEARANCE & DEBATE
Why did Mononykus disappear?
The record of this species at about 70 million years ago does not establish survival until the impact about 66 million years ago; the fate of non-avian dinosaurs as a group cannot replace species-specific evidence.
The last fossil or observation marks the youngest evidence currently known, not necessarily the death of the final individual. Explanations are strongest when timing, environmental change and population biology agree; otherwise the profile preserves uncertainty instead of assigning a single dramatic cause.
09 / FREQUENTLY ASKED QUESTIONS
Mononykus FAQ
What was Mononykus?
This archive records Mononykus under the scientific name Mononykus olecranus, with an age of About 70 million years ago. Each tiny forearm ended in one stout main claw, perhaps used to tear open insect nests like a modern anteater.
When did Mononykus live?
The current archive range is About 70 million years ago; its youngest recorded stage is Late Cretaceous.
Where was Mononykus found?
The archive currently lists Semiarid dunes and river valleys of Mongolia. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Mononykus?
A partial Nemegt skeleton preserves the unique forelimb, chest, hindlimbs and tail; relatives fill gaps in skull and feather anatomy.
04 / SOURCES & FURTHER READING
Check the source record
Use the scientific name to compare taxonomy, occurrence records and the fossil record. Database coverage and classifications may differ.
05 / REVISION HISTORY
How has this record changed?
- Completed an AI-assisted bilingual audit of the archive record, corrected identified issues and clarified evidence limits; independent editorial review is pending.
- Expanded into a structured bilingual profile with anatomy, ecology, range, evidence, debate and FAQs; independent editorial review is pending.
- Verified authoritative entity sources and added three responsive reconstruction sizes.
- Initial bilingual species record published.
06 / CORRECTIONS & ADDITIONS