My chickens are in a large 5' tall dog kennel. It's big...probably 50' x 100'. There is a stock panel fence down the middle for a couple of sheep and a nice covered but open shed with some roosts in it for the chickens. But they won't use the shed. They insist on sleeping on top of the sheep shed, on the fence, and on top of a cage that holds some smaller chickens. It's fine, except if it happens to rain one night, they will get soaked. I have put these silly chickens on the roosts after dark 3 nights in a row and yet they refuse to get on the roosts on their own....prefering to sleep out in the open. I can't lock them in the shed...there is no front on it. Any suggestions how I can make these birds use the nice shed I provided them with?