I've read a book about a guy in a post-apocalyptic world who had a chicken that later on showed herself to be some kind of an alien. Pretty weird stuff but it makes sense in the book.
I remember the cover, of course there was a chicken/hen on it but not the title. It was a very interesting sci fi novel, only read it once probably more then 10 years ago. It would be great to find it again. I believe it was written by a British or American author.