Status: Least Concern

It gets its name obviously from the large frill around its neck which is connected to its jawbone by long spines of cartilage. When it gets scared (or during courtship or competition between males) it will open its mouth to expose a bright pink or yellow lining and flare its frill out in an attempt to freak the other creature out (or charm it I guess, depending on the situation).
Here’s some really cool footage of the Frilled Lizard defending its territory… but then wimping out and running away as a bird gets too close. Understandable.
Don’t remember the scene? Well then I present to you for your viewing pleasure… the Dinosaur-Eats-Evil-Fat-Man Jurassic Park clip.