Below is a full 3D interactive model of Maiasaura, a 9-meter duck-billed hadrosaur from the Late Cretaceous (75 million years ago). Use your mouse to rotate the model, tap the buttons to walk, zoom, or toggle the size-comparison silhouette, and click body parts to reveal facts.
Preparing the 3D scene...
Skin color and texture are an artistic reconstruction based on fossil evidence of related species. The skeleton is based on real anatomical research, but the exact musculature and skin patterns are interpretive - fossils preserve bone and teeth, not soft tissue.
Maiasaura 3D Viewer
By the FreeToolOnline Team
Rotate, walk around, and scale this Maiasaura (Maiasaura peeblesorum), a 9-meter duck-billed hadrosaur (herbivore) that lived 75 million years ago in the Late Cretaceous. Maiasaura means "good mother" - fossils show they nested in herds and cared for their young.
Size: 9 - 10 meters long, 4 - 5 meters tall, 2,300 - 3,500 kg.
When: 75 million years ago (Late Cretaceous, Campanian).
Where: Montana, USA (Egg Mountain fossil site, first discovered 1979).
| Trait | Value |
|---|---|
| Length | 9 - 10 m |
| Height | 4 - 5 m |
| Weight | 2,300 - 3,500 kg |
| Era | Campanian (Late Cretaceous) |
| Diet | Herbivore (leafy plants) |
| Special Feature | Nesting behavior; herds with eggs and young |
Nesting colony: The Egg Mountain dig (discovered by Jack Horner) revealed extensive fossil evidence of Maiasaura nesting sites - thousands of eggs arranged in herds, fossil embryos inside eggs, juvenile skeletons of various sizes, and adult bones surrounding the nests. This is strong evidence that Maiasaura parents fed and cared for their young before they left the nest, unusual behavior for reptiles but common in birds.
Skin and color are an artistic reconstruction - fossils do not preserve skin color or exact surface texture. The model shows a plausible countershading (darker above, lighter below, seen in modern reptiles and birds) and a skin tone consistent with theropod lineage, but the exact pigmentation is interpretive. The skeleton structure, teeth, and posture are based on real fossil anatomy. Click body parts in the viewer to reveal the actual published measurements.
Frequently Asked Questions
What does "Maiasaura" mean?
Maiasaura means "good mother lizard" in Latinized Greek. The name reflects the discovery of fossils showing that Maiasaura cared for their young at the nest - behavior that was rare or unknown in reptiles when fossils were first interpreted in 1979.
How do we know Maiasaura nested in herds?
The Egg Mountain fossil site in Montana preserved thousands of eggs arranged in nesting colonies, juvenile skeletons of various growth stages, embryos inside unhatched eggs, and adult bone beds. This evidence suggested parental care and herd nesting behavior - similar to modern birds and crocodilians.
Was Maiasaura a meat-eater or plant-eater?
Maiasaura was a herbivore. It had a specialized duck-like bill (lambeosaur features) designed for stripping and chewing leaves, plants, and cycads. Hadrosaurs often fed in herds on low-growing vegetation.
How big was a young Maiasaura?
Fossil juvenile Maiasaura specimens range from 1 to 6 meters long. Hatchlings were probably small (estimates 0.5 - 1 meter), and growth continued until they reached the adult 9 - 10 meter length. Nesting colonies show multiple juvenile sizes, suggesting the young stayed at the nest until they reached a few meters long.
When did Maiasaura live?
Maiasaura lived 75 million years ago during the Late Cretaceous (Campanian stage), in what is now Montana, USA. This was about 10 million years before the mass extinction that killed the non-avian dinosaurs.
Is this model scientifically accurate?
The skeleton, proportions, and posture are based on real fossil anatomy and modern paleontological research. However, skin color, exact muscle structure, and surface texture are not directly known from fossils and represent an artistic interpretation based on comparative anatomy (modern reptiles and birds) and fossil trace evidence. The model honors what we know while being honest about what remains uncertain.
How does this 3D viewer work?
The viewer runs 100% in your browser using WebGL and the open-source three.js engine - no server, no upload, no ads. Your device processes the 3D scene locally.