NormalPachycephalosaurus
Pachycephalosaurus wyomingensis
pak-ee-SEF-ah-loh-SORE-us· “thick-headed lizard”
🕰️ Cretaceous🍽️ omnivore🦴 Pachycephalosauridae
4.5 m
Length
1.8 m
Height
450 kg
Weight
The famous head-butting dinosaur, with a domed skull roof up to 25 centimetres thick surrounded by a crown of bony knobs. Rivals may have rammed each other like bighorn sheep.
When
Late Cretaceous, ~70–66 million years ago
Found in
United States
Discovered
William Winkley, 1931
Did you know?
- Its skull dome was 20 times thicker than a human skull.
- Some skulls show healed injuries from head-on collisions.
- Young ones had flat heads that domed as they grew.
Artwork: TotalDino, Wikimedia Commons, CC BY-SA 4.0.