I have two 13 year old males, one 11 month old male and one 3 year old female cockatiel. None of the males like the female, they chase her away from them in their cage and when they are out of the cage they don't want her around. I feel sorry for her, she is the bottom of the pecking order. I would like to have one male be her mate but she has been around almost 3 years and it doesn't seem like it will happen. They are all kept in a very large aviary cage.