Each one of them used to have his/her own cage. They got bonded and now I can't separate them. Same thing happened with my male cockatiel, After loosing his cage mate he moved-in with the budgies. I wasn't sure this was going to work so I left his cage for 3 week but he never went back.Is it safe to house two different bird species in the same cage, especially if one it larger than the other?