A bearded dragon's third eye is on top of the dragon's head, they use this eye to sense if a predator is right above it, where naturally bearded dragons couldn't see.
By: L Church flickr.com CC-BY
Bearded dragons get their names from the space on their throats that when threatened, will puff out. Usually in this process it will even black. They do this to make themselves look more intimidating when apposed by enemies
By: Matt commons.wkimedia.org CC-BY
As you may have seen in the "Diet" section, a pet bearded dragon will eat vegetibles and crickets. However, the non-domesticated bearded dragons will somtimes eat smaller lizards!
By: Biology Corner flickr.com CC-BY-NC