My chickens will not use their roost, and instead huddle together in the wood shavings in the corner of their coop right in front of the window, presumably the coldest, draftiest part of the coop. I cleaned out the coop today and discovered that that while the rest of the shavings were nice and dry, that corner was totally soaked through to the wood floor. They have a 2x4 roost just a few inches away, wide part up. It is painted white, if that matters, and is about a foot off the ground. We've tried placing them on the roost repeatedly but they hop right off. I think this must be our fault for taking so long to build the roost. We didn't build it until they were about 2 months old. What can we do to convince them to get up off the cold, wet, drafty floor and onto their nice, warm, dry roost?