I started off with two hybrids, and then when they reached 18 months with me I bought two more hens as I wanted them to eventually take over egg laying duties and I could let the first two have a happy retirement. The guy who sold them to me offered to take them and kill them but I didn't want to do that. After the usual week's viciousness and fighting, the two newbies seemed to settle in well and all four were laying happily. This went on for a month or two, and then one hen, not sure which, started laying thin shell eggs which were quite watery whites. So one a day was usually smashed in the laying boxes but other than that all was fine. I have noticed in the last few days that one of the new chickens is spending all day in the nesting box and won't come out. When I let them out to free range in the garden she comes out but other than that she spends all day in there. At the same time, none of my chickens are laying at all. I've gone from four eggs a day, to three, and now no eggs at all for the last four days...... This is unheard of and I might even have to BUY some supermarket eggs. Can anyone give me any idea of what might be going on? Thanks I'm advance.