Prevents predatory mammals and birds from reaching into the birdhouse and destroying the nest and occupants Approved by the Humane Society Protects eggs and provides a safe entrance for adults Designed by naturalists to protect nesting songbirds. Keeps predators and larger birds out by extending the entrance while providing a safe entrance for adults. The Bird Guardian was designed for all cavity-nesting backyard birds. Patented, tested and approved by naturalists, these one-of-a-kind products are constructed of strong durable plastic made to last year after year. These well engineered products will prevent squirrels, raccoons, opossum and cats from bending their arms to reach the resident birds. Crows, bluejays, grackles and others have no room to get their shoulders in your nest box The Bird Guardian has a patented tail-brace that allows the bird easy access. Each year scientific studies and tests continue to prove these products superior in the battle to save our endangered backyard songbirds.Attaches easily with 3 included screws, and fits any 1" to 1-1/2" opening. Choose original Bird Guardian or Natural with tree bark look. Original: 1-1/2" dia x 2-1/2"; Natural: 4" x 3" x 3".Please click on "More Information" for bluebird instructions.

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