I have almost 60 birds of various breeds. At this time 15 of the hens have been laying for a year, 24 are just now starting to lay, and the rest are to young yet or roosters (2 mature, 2 immature). Anyway, to the point. I am not getting as many eggs daily as I was say 3 months ago, and every once in a while I get a really thin shelled egg, or a rubbery egg. They have layer feed, corn, oyster shell, grit, and they are free range. I can't figure outwhat is wrong. They have plenty of nesting boxes and roosting spots and everybody gets along just fine! So what can be wrong? All seem happy and healthy!