Still fairly new to the world of pigeons, though we've come so far! We have two males in one cage (father and son) who often play "pecking order" and fight for top shelf. It is about 6'sq. x 4'high. When we tried to put another one into that same cage they all fought. We have that one in a converted parrot cage. We are currently making plans for a larger loft hoping to have them altogether, and wonder if they will be able to share the new space. Is this just a territorial thing? Any suggestions? They are tumblers and a roller. And this feels like a silly question but is it OK to mix the different kinds?