 Free Bluebird Bird House plans - Sparrows can be a problem. Tear out their nests and temporarily plug the hole until they move elsewhere. Wasps can also be troublesome and may even drive bluebirds away. Spray wasp nests and remove them. Predators such as cats, raccoons and snakes can destroy nests. An inverted metal cone or a metal sleeve can help keep these animals from nests. Steel pipes coated with grease also can be used to mount the boxes. While this box is designed for bluebirds, it may be used by wrens, chickadees, titmice, tree swallows or even flying squirrels. If you want to try for these species, place the box in trees 10 to 15 feet above the ground in wooded areas. If these boxes are placed on poles or in dead trees which are in or over water, tree swallows or prothonotary warblers may use them.
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