This is the wrapjaw dragon. Its upper jaw is jointed in order to better grasp struggling prey before it can be killed. It can also be used to pick up nesting material independently from the true mouth, giving these dragons the ability to selectively let go of different items.
The wrapjaw dragon is distantly related to the creature below. The upper "jaw" of the dragon is actually derived from a fusion of the true upper jaw with an extension of muscles and tendons from the neck. The creature below represents a more basal lineage that has yet to achieve a complete fusion.
Hello, my name is Dan. I am an author, artist, explorer, and contemplator of subjects large and small. I like bacon. I like pizza. I like bacon pizza. I enjoy long walks on the beach, but prefer the mountains. I am a huge fan of Jesus. When I grow up, I want to be just like him and create my own universes.