How will my birds react if I move them to an outside aviary?

If you can put a heated perch or ceramic heat lamp that would be good. Cover the top portion of the aviary to prevent strong wind draft. Cover all around the top portion where they normally perched. cats on top of the aviary and big bird flew on top of tehm is not a problem. They will eventually realize that these cannot get to them. I have dog and wild bird all over my outdoor aviary all the time. My birds get used to them and ignore them.