Hello! I have a 2 year old female cinnamon cockatiel and in a months time I will be getting a 3 year old white cockatiel(which I've never seen before). How would I introduce them and how would I go about it. She is very territorial with her cage, food etc. I let her out every morning for a fly (she is inside) and she just hangs around until she has to go back. With a male would all that change. Any help would be appreciated.