My Ameraucanas have always been fairly broody. Every year I have a couple start sitting, usually during the summer, but this has been a weird year weather wise, and the birds have been just as weird. I got off to a late start because about 2 weeks after they started laying they all stopped w/o warning for 2 months. Now I still have birds laying, which I've never had in October, and one broody, which I've also never had this late in the year. We had a very mild summer - the first I can remember that we didn't have a single triple digit day, and everyone molted early, so maybe that's why?