I'm new to chickens, so excuse this dumb question.... We have 6 buff orpingtons. One of them, we were sure was a rooster, but we saw her lay an egg. Her name is Pat. The other 5 look exactly alike. Since they are just starting to lay, we would like to know who's who. Someone is laying rubber eggs and I would like to keep an eye on her. How do you guys tell them apart? I thought maybe I could put a different color zip-tie on their leg, but my husband thinks they might peck at it... Any ideas? Thanks.