Exclusive! Talented hunters of insects, tree swallows are beneficial as well as beautiful, with their iridescent blue color. The oblong entrance to our box lets several fledglings be fed, not just the dominant one. Place 5-6 feet high and at least 7 feet apart on trees or posts in an open space, preferably with water nearby. 11-3/4" H x 6-3/4" W x 7" D.