One of my rats has become more and more aggressive over the month or so that I've had him. He's started biting everything. He'll come flying at my hands if they're anywhere near the cage, and he's even worse when I have my hands in the cage. I used to think he was biting me because I smelled like food, but he's been biting me constantly for the past couple of weeks, so I think it's more of an aggression issue. He used to let me pet him and handle him, but now he just comes charging at me and sinks his little teeth into my fingers. He'll take food from my hand just fine but if I'm near the cage and I don't have food, he'll just start biting. I never feed my rats through the bars and his cagemate has never attempted to bite me. Why is he acting like this? How can I fix this problem? I know neutering is an option, but are there any other ways besides neutering?