Something I've noticed my Mernin doing is a sort of head bobbing action. Her neck just sort of extends and then goes back to normal repeatedly. I thought nothing of it, that maybe it was just something birds did. Upon further research, I found that it is often to help them swallow food, or a sort of mating ritual. However, Mernin will do it randomly, almost as if she has no control over it. She will do it even if she hasn't eaten recently, and I have no other budgies... I'm probably just over-reacting, but I'm starting to worry.
Is anyone else familiar with this? Could there be an issue at hand?
My birds do the same, most likely, if it's just stretching the neck with beak open, it's just normal, just making sure the food is placed the right way in the crop.
Mine do it quite often some days, and they are healthy
From your description, it seems your Mernin is adjusting her crop and this is normal.
This is not related to mating. Budgies can also regurgitate food to a mate as sign of affection, it's not strictly related to mating or mating rituals.
RIP sweet Tito (Summer 2008 - January 17th 2013).
You are missed and never will be forgotten.