Basic Bluebird House Plans - Basic one-board bluebird bird house … Bluebird House Plans. Bird House Portal Protectors. Wren House Portal Protector Opening: 1″ Diameter. Birdmobile Paper Bird … Some assembly required. The Noel Guard comes inside the birdhouse and installs easily with a screwdriver. Quick View. Prevents birds from enlarging the entrance hole to birdhouses. Pictured are several types of predator guards which have proven to be effective and described as follows: 1. get a predator guard … Feb 16, 2016 - Bird houses with perfect snake guard/porch - snakes hate these wire porches https://www.duncraft.com/Duncraft-BirdSafe-Predator-Guard-House 6 x 6-3/4 x 12-1/4 inches tall. Wooden Birdhouse Predator Guard – 1.25 inch $ 4.95. Predator guards attached to the post of the nest box will discourage predation by raccoons and squirrels. Details. One of the most unique bluebird house plans we have seen. Go to the bluebird house plans page to view the detailed plans which includes an insulated layer and heat vent tube to reduce the temperature inside the birdhouse on hot days. Rugged brown and green recycled plastic with ventilation and drainage. 1-1/2 inch entry hole with Noel Guard predator guard Mounts on top of the 72 inch tall sectional pole, included.