BestNest Coveside Observation Bluebird House Package with Poles Provides all you need to mount, shelter, and monitor eastern bluebirds in your yard. The 2 Coveside Premium Two-Sided Observation Bluebird Houses are crafted specifically for eastern bluebirds The included Coveside Blowfly Inhibitor Screens help nests stay safe from parasites. Included poles have mounting adapters and ground sleeves for easy placement