Provide beautiful, musical bluebirds a secure roosting option by adding this Sparrow-Resistant Cedar Eastern Bluebird House by Prime Retreat to your yard. This shelter, based on thorough research from the University of Kentucky, caters specifically to bluebirds and deters sparrows from nesting. This robust, all cedar unit sports a 4" long and 0.75" tall, slot style entry, which bluebirds will handily use but sparrows dislike. The slanted roof overhangs this entry, keeping the interior dry, and open corners here provide ventilation. An included, 1.75" thick, wooden block sits at the base of the cavity, creating a shallower nesting area which further discourages sparrows. This may also be removed for versatility, and drainage holes in the base aid in keeping the nest dry. Lift the front panel upward to periodically check the nest, and turn the metal latch to keep the chamber securely closed.