Pic is not in focus...but @Eggcessive might know.
How long has it been like this?
How is the birds breathing...any wheezing?
Anything coming out of the nostrils?
Pics please.....
...and location:
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, (laptop version shown), then it's always there!