Recently, however (last few weeks), he has been bending his neck all the way back (think of doing a backbend with just your neck so that it touches your back) and sometimes flailing around at night. He usually ends up at the bottom of the cage and sleeps there. But then the next day he's fine and up on perches and eating. He does do the head bending during the day, too, though.
I've read all I could on twirling, and he doesn't exhibit those rapid twisting behaviors like in the videos on ladygouldianfinch.com. He's not fluffed up, so I don't think it's an infection, but I'm not sure what to do. So far I've just given him heat and put towels on the bottom of the cage to soften it for him.
Any suggestions? I'm worried about him and I want him to be as comfortable as possible.
