The Eastern Bluebird has suffered due to competition with non-native species, such as the house sparrow, but it is making a comeback with the help of enthusiasts and people seeking to help control insect pests naturally. Bluebirds eat many of the insects that are common pests for gardeners and farmers. Their appetite for insects makes them an important part of an integrated pest management strategy.
Links
[1] https://extension.umd.edu/sites/extension.umd.edu/files/_docs/programs/woodland-steward/FS799_WMgtEBluebird.pdf
[2] https://extension.umd.edu/tags/bluebird
[3] https://extension.umd.edu/tags/eastern-bluebird
[4] https://extension.umd.edu/tags/birds
[5] https://extension.umd.edu/tags/attracting-wildlife
[6] https://extension.umd.edu/tags/wildlife-management
[7] https://extension.umd.edu/woodland