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. Once one of our most common wild birds, House Sparrow populations have sharply declined in recent years, partly due to a lack of natural nesting sites. Help combat this by erecting a House Sparrow Terrace, so-called because the inside is split into chambers to fit three pairs of these colonial, social birds. For help and information on where to site your nest box, see our help and advice page.