I have just recently noticed this with my chickens as well. I wasn't sure what to do about it. I am also interested in suggestions for getting rid of these things.
I live in WV and we say lunch for the noon meal, unless it's Sunday and then we call it dinnner. The evening meal is always called supper, unless we are going to a resturaunt and then it is out to dinner. I think someone else said near the same thing.