Ive heard that before but there isn't one that is more dominate then the other and they are not usually aggressive towards each other. These two have been together for so long I'm wondering if they are just that used to each other. They are always together and never seem nervous or upset. I've only been bitten once and that was when they were apart and I tried to pick one up while the other was shedding. They were both very laid back almost docile until recently. It's like they are extra hungry. I just wish I knew someone who could come take a look at them and make sure all their actions are normal. I've been worried about feeding them rats because I can see the white between their scales in their necks when they eat adult mice. Are you all sure a rat isn't too big for them? The rest if their body size seems fine for eating rats.