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Mononykus Olecranus
Image: Mononykus olecranus dinosaur
WALLPAPER
Mononykus olecranus was a peculiar dinosaur with very strong—and very short—arms, each of which had only one finger.
Image © National Geographic Society
Mononykus Olecranus Profile Page

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Mononykus Olecranus Printable Factsheet

Prehistoric Features
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News: Prehistoric Cave Discovered; 8 New Species Thrive Inside

Quarry workers in Israel recently uncovered an ancient cavern that houses an entirely unique ecosystem, including eight never-before-seen animal species.

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What’s Wrong With This Picture?

See past National Geographic dinosaur illustrations and listen to Thomas Holtz, a University of Maryland paleontologist, discuss what we’ve learned since our 20th-century dinosaur coverage.

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Article: Big Bad Bizarre Dinosaurs

Findings of bizarre Mesozoic fossils prompt John Updike to ask: What has evolution wrought?

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