Raccoons Raccoons are a major threat to bluebirds as they can climb poles and reach into nest boxes to remove eggs and nestlings. Using a stovepipe baffle on the pole below the nest box can help deter them
Snakes Snakes, especially black rat snakes, are skilled climbers that can access nest boxes. A stovepipe baffle is effective at preventing snakes from reaching the box .
Cats Both feral and domestic cats pose a threat to bluebirds, especially fledglings on the ground. Mounting the nest box on a pole with a baffle can help protect against cats
House Sparrows House sparrows are an invasive species that aggressively compete with bluebirds for nest sites. They will destroy bluebird eggs and nestlings.
Squirrels Red squirrels can enlarge the entrance hole of a nest box and take up residence inside. Metal hole reducers can prevent squirrels from entering
To protect bluebirds, it's important to mount nest boxes on poles with predator baffles, avoid pesticides, and control invasive species like house sparrows.
By providing a safe environment, you can attract and retain bluebirds in your yard.