Nope, he's not the only one. But for Louie (my male ig) this is his first breeding season, I think. And it has been terrible. He bit my arm a few months ago and after that I had to make him stay in his enclosure. I am still waiting for the aggressiveness to subside. I don't know what to do short of calling in an exorcist! Thank goodness your brother is okay (I assume) after having a chunk out of his neck! It could have happened in the area of some major veins and arteries- that's a scary thought! I look at Louie after he's fallen asleep, and he looks so cute and innocent. I miss my pal that I could hold and pet, but I still haven't given up on him!