Rugged brown and green recycled plastic with ventilation and drainage. One of the most unique bluebird house plans we have seen. Birdmobile Paper Bird … Bird House Portal Protectors. 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. 1-1/2 inch entry hole with Noel Guard predator guard Predator guards attached to the post of the nest box will discourage predation by raccoons and squirrels. https://www.duncraft.com/Duncraft-BirdSafe-Predator-Guard-House Feb 16, 2016 - Bird houses with perfect snake guard/porch - snakes hate these wire porches Bluebird House Plans. 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 … Mounts on top of the 72 inch tall sectional pole, included. Details. Wren House Portal Protector Opening: 1″ Diameter. Wooden Birdhouse Predator Guard – 1.25 inch $ 4.95. Quick View. Some assembly required. Basic Bluebird House Plans - Basic one-board bluebird bird house … The Noel Guard comes inside the birdhouse and installs easily with a screwdriver. 6 x 6-3/4 x 12-1/4 inches tall.