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Ceratopsians are dinosaurs that are known for their horns and bony frills. Examples of horned ceratopsians include:
- Triceratops
- Styracosaurus
- Einiosaurus
- Rubeosaurus
- Centrosaurus
- Achelousaurus
- Pachyrhinosaurus
- Albertaceratops
- Chasmosaurus
- Pentaceratops
- Utahceratops
- Zuniceratops
One dinosaur with spikes was Gigantspinosaurus, a relative of Stegosaurus that had spikes instead of plates. Many types of stegosaurs had tail spikes, or thagomizers, for self defense.
Some ankylosaurs had armor that included spikes. For example:
- Polacanthus
- Gastonia
- Edmontonia
- Sauropelta
- Mymoorapelta
- Minmi
- Aletopelta
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