Winter Roost. This ingenious roost provides much-needed protection from winter's cold. It will attract birds that nest in cavities or nest boxes, such as Chickadees, Wrens, Nuthatches, Titmice, smaller Woodpeckers and Bluebirds. The entrance hole is low to preserve heat inside the roost, and eight perches and two mesh wire strips make it easy for birds to get close together for warmth. Plus, the hinged floorboard makes cleaning easy.