You Can Help birds survive The Coldest Days Of Winter, by Providing a winter roost box.You'll Need wood ... I like rough-sawn cedar dowel rod ..., glue, nails, and wood screws. The followings instructions Carefully measure and cut out The Six pieces.Drill a 12-inch diameter Hole in the front room of the House, near the bottom ". Use the Rough Side of the wood for the Inside of the box or drill holes oven into, but not through, and insert ... The Wood Heat Rises perches.Since, The Entrance hole at the bottom "means specified in the box Will stay warm.And When spring finally comes, The Front rotate to convert it Into a bluebird house!