The Malmedy Nest Box has a 32mm entrance hole making it ideal for birds such as Great Tits, House Sparrows and Tree Sparrows. Made from robust timber up to 18mm thick and left untreated so you can add a wildlife friendly colour stain or treatment of your choice. 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. This nest box is also available with 28mm entrance (Boullion 28mm Nest Box - 90802) hole so you can attract more wildlife to your garden.