Budgie bites his nails
I have a pet budgie in which I bought about 2 months ago. About 1 1/2 of a month later, (3-4 weeks from today) he started biting his nail on his right foot. And now his right foot is missing a nail, one is hanging loosely, and one toe's nail seems to be completely fine. His left foot is unscathed, and sometimes he leans on his left foot.
I also need to know if him sneezing every 15 - 20 minutes is a bad thing. If it is, then does it have something to do with being cold?