Actually, I thought "hoax" too. (And I'm afraid I do still think it about the McSpermy, sorry, flutterbee ... although, to be fair, McDs would do their level best to keep that out of the press.)
But the chicken thing is really true. I did a search. It happened a few years back. One thing that somewhat indicates it's not a hoax is the fact there's a name, place and date on the article.