What are 20 different dinosaurs that had spikes or horns?

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