Birds are pretty funny like that.

I caught Lucy asking to be preened from Alex, but I think Alex is too young to understand what she was asking for since he started to play with her crest feathers. It lasted for only a few seconds, and I haven't seen them do that since.
It seems budgies have a thing for rubbing their heads on stuff. I've noticed a lot of them doing it to bells. They'll stick their heads in them, and sometimes talk in them.
Or maybe that part's just Disco.