Keeping sparrows out of bluebird houses can be a challenge, but there are several effective methods you can use to deter them. One common technique is plugging the entrance hole at the end of the nesting season and leaving it plugged until the bluebirds return in the spring.
By plugging the entrance hole, you prevent sparrows from roosting in the box during the winter. This is important because sparrows are known to stake an early claim on nesting sites, often evicting other birds, including bluebirds. Plugging the entrance hole serves as a physical barrier to keep sparrows out and allows bluebirds to have a fair chance at nesting in the box.
To plug the entrance hole, you can use various materials such as a wooden or plastic plug, a small piece of mesh wire, or even a metal plate. Ensure that the plug fits securely and tightly in the entrance hole to prevent sparrows from squeezing through. It’s important to note that the plug should be easily removable in the spring when the bluebirds return.
Another method to keep sparrows out of bluebird houses is by employing a predator guard. Sparrows are less likely to approach a nesting box when they perceive a threat nearby. Predator guards can be in the form of a metal cone or a slanted roof that prevents larger predators, such as squirrels or snakes, from accessing the box. This not only deters sparrows but also helps protect bluebirds from potential harm.
Regular monitoring and maintenance of the bluebird trail are crucial in keeping sparrows away. Clear out any old nests or debris from the boxes during the winter months to discourage sparrows from using them as roosting spots. Additionally, inspect the boxes for any signs of damage or wear and repair them if necessary. Providing well-maintained and appealing nesting sites for bluebirds will increase their chances of successfully nesting and reduce the likelihood of sparrows taking over.
It’s important to note that while plugging the entrance hole and using predator guards can be effective deterrents, they are not foolproof methods. Some determined sparrows may still find ways to access the boxes. Therefore, it’s essential to remain vigilant and continue monitoring the bluebird houses throughout the nesting season.
In my personal experience as a bluebird trail operator, I have found that combining multiple tactics can yield the best results in keeping sparrows out of bluebird houses. By plugging the entrance hole, using predator guards, and maintaining the trail, I have been able to create a more favorable environment for bluebirds while discouraging sparrows from taking over. It requires dedication and ongoing effort, but the reward of seeing bluebirds successfully nesting in the boxes is well worth it.
To summarize, plugging the entrance hole of bluebird houses at the end of the nesting season and leaving it plugged until the bluebirds return in the spring is an effective method to prevent sparrows from roosting and staking an early claim. Additionally, using predator guards and maintaining the bluebird trail are important steps in deterring sparrows and creating a favorable nesting environment for bluebirds.
