Without question, these are the finest bluebird houses available. Entrance holes are correct for each species listed below. Wooden predator guard keeps starlings, squirrels and other unwanted colonizers out. Small floor discourages colonization by sparrows. Designed by Frank Zuern to be a safer nesting place for eastern bluebirds, this horizontal box simulates a hollow tree branch.
Field test shows high acceptance and survival rate for bluebirds.
As with all bluebird houses, features a wooden predator guard at the entrance. Side opens for easy observation or clean-out.