Euoplocephalus
- When: Late Cretaceous
(76–67 mya) - Where: North America
- What: Ankylosaur
- Weight: 2–2.5 metric tons
- Length: 6 meters
- Diet: Herbivorous
- Discovered: 1910
cephal
Head
(from the Greek word kephale)
Pachycephalosaurus
- When: Late Cretaceous
(70–65 mya) - Where: North America
- What: Pachycephalosaur
- Weight: 450–1,000 kg
- Length: 4.5–5.5 meters
- Diet: Herbivorous
- Discovered: 1931