Drag to rotate Estemmenosuchus, scroll or pinch to zoom, and click a body part - the head, a leg, or the tail - to read what the fossils tell us about it. The panel beside the model carries the real figures.
Estemmenosuchus was a Permian therapsid, not a dinosaur - turn on the human figure to see how its stocky, bumpy-skinned body compared to a person, with paired bony crowns rising from its skull.
The body shape here follows the fossil skeleton found at the Ezhovo site in Russia, which is why this animal is unusually well documented for its age; the measurements in the panel are the ones actually published.
Estemmenosuchus 3D Viewer
This page renders Estemmenosuchus mirabilis as a 3D model you can spin in the browser - drag to rotate, scroll or pinch to zoom, toggle a 1.8 m person beside it for scale, and click its head, a leg, or the tail to read a fact about that part. Estemmenosuchus was a therapsid - a mammal-like reptile - not a dinosaur.
Estemmenosuchus mirabilis lived roughly 269 to 265 million years ago, during the Wordian age of the Middle Permian, tens of millions of years before the first dinosaurs appeared. It grew to about 3 m long, with a large skull carrying paired bony, antler-like crowns thought to have been used for display or combat between rivals - the genus name Estemmenosuchus means "crowned crocodile" in Greek, even though the animal was not related to crocodiles at all.
It was described in 1968 by Soviet paleontologist Pyotr Chudinov, following his 1960 description of the related type species Estemmenosuchus uralensis. Both come from the Ezhovo fossil site near the town of Ochyor in Russia's Perm region, where some specimens preserve impressions of the animal's wrinkled, bumpy skin - unusually well documented for an animal this old. Its diet is still debated among paleontologists, and published weight estimates vary widely, from roughly 200 kg to over a tonne.
| Measure | Figure |
|---|---|
| Length | about 3 m |
| Weight | roughly 200 kg to over 1,000 kg (estimates vary widely) |
| When it lived | about 269-265 million years ago (Wordian age, Middle Permian) |
| Diet | Herbivore or omnivore (debated) |
| Described | 1968, by Pyotr Chudinov |
| Found | Ezhovo site, near Ochyor, Perm region, Russia |
Everything runs on your device with WebGL, so the model works without an account and without sending anything to a server. Skin impressions are known for this animal, which is unusual for something this old, but the exact color shown here is still an artistic reconstruction; the numbers above are real published values, with a range given where sources disagree.
Frequently Asked Questions
How big was a real Estemmenosuchus?
Estemmenosuchus mirabilis grew to about 3 m long. Published weight estimates vary widely, from roughly 200 kg to over a tonne. Turn on the human figure in the viewer to see the scale against a person.
Was Estemmenosuchus a dinosaur?
No. Estemmenosuchus was a therapsid - a mammal-like reptile more closely related to the ancestors of mammals than to dinosaurs. It lived during the Permian period, tens of millions of years before the first dinosaurs appeared.
What were the bony crowns on its head for?
Most researchers think the paired, antler-like bony crowns on the skull were used for display or head-to-head combat between rivals, similar to how some modern horned animals use theirs, rather than for anything crocodile-like despite the genus name.
Is the model scientifically accurate?
The body proportions follow a fossil skeleton found at the Ezhovo site in Russia, and some specimens even preserve impressions of the animal's wrinkled, bumpy skin. Even so, the exact skin color shown here is an artistic reconstruction - fossils do not preserve pigment. The length, era, and description figures shown are real published values.
When and where did it live?
Roughly 269 to 265 million years ago, during the Wordian age of the Middle Permian, at what is now the Ezhovo fossil site near the town of Ochyor in Russia's Perm region.
Do I need to install anything to view it?
No. The model renders in your browser with WebGL - no app, no account, and nothing about your visit is sent to a server. The 3D engine loads once and is then cached.