I have noticed an interesting switch in the behavior of my lions. I have 2 lions and one is almost twice the size of the other. I had the small one many months before getting the new larger one. When I introduced the large lion, he would eat but was not as quick to react to the food. The smaller lion was aggressive and would swim in front of the other's mouth and steal the food before he could get to it. It was hard to spot feed the large lion because the small one would get to it first and wouldn't know when to stop. I think the small one was the dominant because he had established his territory. The large one must have submitted because he was new to the tank. Well, size is obviously a factor here. The roles have completely reversed. I can barely feed the small lion because the big one is soooo aggressive and gets to the food first. He takes it right from the prongs while I dangle the food in front of the smaller one! Anyway, I thought this was interesting.