We bought a beardie from a expo in Toronto that acts the exact same way. I'm not sure how old he is but he's like 7-8 inches long ... if I put my hand in his tank to get his food bowl for superworms he puffs up, beard goes black, he hisses, opens his mouth as wide as it'll go! I don't dare take him out, he tries to run away and will jump out of your hands! He's the only one like that as well!