Bird boxes are a great way to increase biodiversity. For birds that nest in tree cavities, but have no way of making the cavities themselves, nesting habitat is often limiting and competition can be intense. In the agricultural landscape, there is often a shortage of nesting places for these birds. Some birds are insectivorous birds that can be beneficial by managing insect pests such as flies. Reduced abundance of prey has reduced populations of most bird species that eat flying insects. Bird boxes also attract interesting species that can provide enjoyable bird watching.