The Frillneck Lizard (Chlamydosaurus kingie) may look nonthreatening when it is calm, but when its frightened, its another story. When it gets frightened, it raises a frill of skin around its neck that is almost 12 inches across.
http://animaldiversity.ummz.umich.edu/site/accounts/information/Chlamydosaurus_kingii.html
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It looks like a dragon hahaha