You've feathered your nest. Why not help your friends on the fly to do the same? A fall and winter spent outdoors will rid these man-made manses of paint and varnish odors—and, while they weather, they'll provide a welcome resting place for migrating species. Most nesting boxes, as they're also known, are a good fit for small backyard birds, including wrens, nuthatches, chickadees, swallows, and martins. Best of all, they're available in a variety of house styles, from a cozy log cabin to a detailed Victorian. Here, 11 of our favorites.