The national trust robin & wren nest box is a beautifully designed nest box, and would make a lovely addition to any garden or outdoor space. The large, wide opening of this nest box makes it an attractive home for robins and wrens. There is a shortage of natural nesting sites, which is thought to be one of the major factors behind the decline of some of our once most-common birds. By putting up nest boxes, such as this, which replicates a bird's natural nesting preferences, you can encourage them to breed near your home. For: bird. For: robin, song thrush, wren.