An important element in your successful backyard habitat in addition to plenty of food and fresh water is shelter. Many species raise their young in tree cavities. When they are unable to find suitable natural nesting locations, these cavity-nesters readily adapt to man-made bird houses. Your birds will find their nesting places in early spring. Many raise more than one nest of baby birds each year and when the weather changes in the fall and winter months, non-migratory birds seek out these houses to shield themselves from the cold, rain, snow and winds. Birds can be choosy about the perfect house so it’s great when you can give them a few to choose from.