I didn't have birds when I had cancer, so I can't answer your questions. However, my birds are always just happy to see me. They don't hold grudges. They can be a bit too enthusiastic, but that's about all. In all likelihood, you will a bit of attitude followed by tons of hugs and kisses. They MISS you!
So glad the worst is over. Its hell having cancer and trying to live a normal life. Still, its what you have to do to get it back. As always, you are in my prayers.
