I checked for eggs the other day, and if I hadn't counted the chickens before I did, I would have worried that I'd lost one - there are chicken feathers everywhere!  Silver molted earlier this summer, and think the other three are all molting now.  That explains why I'm not getting very many eggs lately too.  (The eggs shown here are fake eggs, kept in the nesting boxes to discourage the chickens from pecking the real eggs.)