My friend Jillian told me about having birthday parties for her chickens! She was quite serious and as I asked questions I found out guests were invited , and CAME, both human and chicken. I could hardly believe what I heard but they sang the birthday song too.
I stopped in the middle of the book I was working on and began Chickens In Birthday Suits, now free for a short time, as an E book, at Amazon.  nancymauerman.com