Armor is evident on numerous animal species from both current and prehistoric times. Dinosaurs such as Ankylosaurus, as well as other Thyreophora (armored dinosaurs such as Ankylosauria and Stegosauria), grew thick plate-like armor on their bodies as well as offensive armor appendages such as the thagomizer or a club. The armor took many forms, including osteoderms, spikes, horns and plates. Other dinosaurs such as ceratopsian dinosaurs as well as some sauropods such as Saltasaurus and Agustinia, grew armor to defend themselves, although armor in sauropods overall is uncommon.