For many years now the bluebird populations have been declining because land has been cleared for new houses, shopping malls and highways.The old wood fence posts that provided nesting cavities are now being replaced with metal posts. Much of the natural nesting cavities for bluebirds and other native cavity nesters has been greatly reduced.
We also have to remember that the House Sparrow and the European Starling have been introduced to the U.S. Both starlings and sparrows are cavity nesters, and both are very aggressive. House Sparrows are small enough to enter any hole that a bluebird can, and are so aggressive that they will chase away the more timid bluebird. Starlings can be excluded from bluebird boxes by using the correct size entrance hole, but will compete with bluebirds for woodpecker holes and other natural nesting cavities.
During the summer, bluebirds feed mainly on insects. In the winter, bluebirds depend on many kinds of wild berries for their food supply. However, the supply of wild berries has also decreased over the years. The few berries that remain are often stripped quickly by large flocks of starlings.Even though the bluebird population has greatly decreased, you can impact the population positively. One very important step you can take to help bring back the bluebird is to provide nesting sites by setting out a bluebird box or starting a bluebird trail. A bluebird trail is simply bluebird boxes placed along a prescribed route. In areas where nesting boxes have been put up in suitable habitat, bluebird populations are increasing. Bluebirding is a great project that people of all ages can enjoy. Many a good bluebird trail has been set up by boy scouts and other similar youth groups.
Another way to enhance your area for bluebirds is to add a bluebird/mealworm bird feeder. These feeders have entrance holes the correct size for bluebirds, and been designed specifically so that your mealworms will not be able to escape from the bird feeder.
These simple steps will encourage bluebirds to stay around your area and help increase the bluebird population nationwide.


