Budgie always eating

by Caroline
(Montreal, Quebec, Canada)

Hi, my budgie (age unknown because it was found; over 5 years for sure) is constantly eating. Every time I go to give him more seeds, he jumps to the bowl right away. This morning I caught him eating on the ground where his droppings are, which I never saw him do because he always hated being down there and would freak out if he fell there. I also noticed that he is getting puffier and not singing as much, though winter is starting, so maybe he's going into hibernation?

He also has no reaction. Usually when I approach his cage, he would show a sign that he saw me, but today he had his head under his wing and not moving. I had to rattle the cage a bit to get him to show signs of life.

His food consists of only a mixture of seeds I get from the pet store (I have a feeling the seeds may be getting stale because the bag is almost done). He was never brought up eating veggies.

Thanks for your help in advance!