No idea why. I lost a girl to a snake bite about 3 weeks ago (Not in the coop, in the barn about 100 feet away) & it seems that it started right after that. First, about 3 or 4 would disappear @ night (they are free ranged on 3 acres) and come back in the morning. Every night, a couple more wouldn't come back. Now only 4 are coming to the coop for lock down. A few of them are roosting in the open barn on the goat fence. the rest however spend 75% of the day, as well as night, underneath a large old shed beside the garage. We've gone from getting close to 20 eggs a day to 2 or 3 in the coop and sometimes we find a couple in the back corner of the hay barn (also open front) We are moving from our rental to our own Farm in 12 days & I am freaking out trying to figure out how I am going to make sure I have all of my birds. How do you get them to start using the coop again? Being free range, they aren't real partial to being picked up.