About a month a go, 4 of my 7 hens started losing their feathers just in front of their tails. The feathers have started growing back nicely. Today, I found one hen dead. :c( Now I am reading that molting usually starts behind the head. I'm wondering if the missing feathers could be the sign of a problem? The hen that died is just about a year old. Help! I don't want to lose any more of my girls!