Mr. Rooster Is Having Some Issues.

[AnimalFamily]

We have a rooster who is not a spring chicken by any means, but still pretty spry for an older fellow.
Recently his 'crower' has not been sounding very good. I really don't mind because he normally stands right outside my windows and crows at all times of the day, however if he has a problem I would really like to help him.
It's quite entertaining when I am on the phone......."Did I just hear a chicken??"
Here lately it has been quite garbled, like he has laryngitis or something?
Otherwise, he seems to be in good health.
I was wondering if anyone here has experience with birds and might know what is causing this?