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
pachy
Thick
(from the Greek word pachys)
Pachyrhinosaurus
- When: Late Cretaceous
(73–69 mya) - Where: North America
- What: Ceratopsian
- Weight: 3–4 metric tons
- Length: 6 meters
- Diet: Herbivorous
- Discovered: 1950