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Natural History: ​How Scientists Discovered Europe’s Missing Horned Dinosaurs

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8 January 2026
By James Hamilton

Reconstruction of the possible appearance of Ajkaceratops. Credit: Original artwork by Matthew Dempsey

While the mighty Triceratops dominated prehistoric landscapes in North America and its relatives flourished across Asia, Europe seemed strangely empty of these iconic animals. Scientists had only a few scattered, poorly preserved fossils to go on — fragments that sparked debate but never certainty. Had horned dinosaurs really roamed Europe at all?

Now, that mystery has finally been solved.

​Scientists from London’s Natural History Museum, working with experts across the UK and Europe, have revealed that horned dinosaurs were hiding in plain sight all along. The key came from a small but important dinosaur called Ajkaceratops.
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First described in 2010, Ajkaceratops was controversial from the start. Some palaeontologists believed it was a true horned dinosaur, while others thought it belonged to an entirely different group, closer to Iguanodon. With only fragmentary remains to study, the truth was frustratingly out of reach.

That changed with the discovery of new, more complete skull fossils. Using detailed CT scans and modern evolutionary analyses, the research team took another look — and the results were striking. Ajkaceratops was confirmed as a genuine ceratopsian, a member of the horned dinosaur family. Even more surprising, another dinosaur known as Mochlodon, long thought to be unrelated, turned out to be the same species. Several other European dinosaurs had also been misidentified for decades.

Why the confusion? According to Professor Susannah Maidment of the Natural History Museum, it comes down to evolution playing tricks. Although Iguanodon and Triceratops look very different, their ancestors shared common traits. Both groups evolved similar teeth, limbs, and body shapes — adaptations for plant-eating lifestyles — even developing four-legged movement independently. When only small pieces of skeleton remain, those similarities can easily blur the lines.

With the puzzle pieces finally fitting together, a long-standing gap in dinosaur history has closed. Horned dinosaurs didn’t skip Europe — they lived there, navigating a world of islands during the Late Cretaceous.

At that time, Europe wasn’t a single landmass but a scattering of islands surrounded by shallow seas. Dinosaurs were surprisingly capable travellers. As the Atlantic Ocean slowly began to open, land bridges and short sea crossings connected continents. Fossils of dinosaurs like Allosaurus found in both Portugal and North America show that these animals could move between lands, possibly by swimming or island-hopping.

The discovery reshapes how scientists understand ancient European ecosystems. As Professor Richard Butler of the University of Birmingham explains, confirming the presence of ceratopsians forces a radical rethink of who lived where — and how these animals interacted in their environments.

It also highlights the hidden power of museum collections. Many of the fossils involved in this discovery had been sitting in drawers for years, waiting for new techniques and fresh perspectives. By revisiting old specimens with modern tools, scientists are uncovering stories that were missed the first time around.
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Horned dinosaurs like Triceratops may be famous for their North American dominance, but thanks to Ajkaceratops, we now know that their quieter European relatives once wandered the island landscapes of prehistoric Europe — unseen, misnamed, and misunderstood, until now.
Sometimes, the biggest discoveries aren’t found in the field, but rediscovered in the collections we already have.

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