The national trust aspen larch 28mm nest box is a lovely elegantly designed nest box and will make a wonderful addition to any garden or outdoor space. With a classic nest box design, it has a green sloping edged roof, the 28mm hole size will be used by tree sparrows, blue tits, coal tits, great tits and crested tits. The nest box can be opened at the front for cleaning after the breeding season. This is generally around october when you can be sure that no more birds are breeding inside. A clean nest box will also attract birds who want to use it as a shelter during colder winter months. 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 birdaposs natural nesting preferences, you can encourage them to breed near your home. Different species prefer different nest boxes and our range has been designed by our team of ornithologists