My brother has a parakeet who is 12 years old and recently with in the 2 weeks he has seen a change in his behavior. Such as: eating but not as much, he seems to be more stiff in his feet (arthritis?), a little wobbly with his balance, has lost a little bit of weight and is sleeping more. Now it could be just because of his age, he is an old bird, but my brothers place always seems to be unusually a little cooler for an apartment. He has been found sitting in his food bowel to keep his feet warm. Although I have had parakeets most of my life I have never dealt with this and this has only been my brothers only parakeet since he was 18, till he got another one a few years back.