Budgie sudden weight gain
I recently went away for 4 nights, and my Dad took my two budgies to his house, (where one of them was born), and he fed them "Trill" bird seed and treat sticks.
At home I feed them "Harrisons" pellets, as recommended by Dr B, and "Trill" as an evening treat.
The older female budgie has suddenly gained weight (not sure how much, as she dislikes being handled, but she looks a lot fatter than when she left. The juvenile budgie looks no different.
She looks as if she is fluffed up, but I have stroked her belly, and she is not fuffier than usual, and looks like that during her normal daily business, which has not changed. She is still just as active.
My question is, could an all seed diet do this within 4 nights or could she be getting ready to lay. I don't think an internal growth could grow so quickly.
If she may be getting ready to lay (sterile eggs), what behaviour would I be likely to see?
She is eating more egg food and has started using her cuttlebone.
Should I provide nesting just in case?
Would she need to see an avian vet to determine things?
If she is just overwight, how could I bring the weight back down? (As mentioned above, the juvenile one has not visibly gained weight.)
Any help or advice is greatly appreciated.