Dinosaurs such as Ankylosaurus, as well as other Thyreophora (armoured dinosaurs such as Ankylosauria and Stegosauria), grew thick plate-like armour on their bodies as well as offensive armour appendages such as the thagomizer or a club. Armoured structures are usually composed of hardened mineral deposits, chitin, bone or keratin.Īrmour is evident on numerous animal species from both current and prehistoric times. It has therefore mostly developed in 'prey' species. Armour or armor in animals is external or superficial protection against attack by predators, formed as part of the body (rather than the behavioural use of protective external objects), usually through the hardening of body tissues, outgrowths or secretions.
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