2/18/2016 7:02 AM
Martins have issues with invasion from European Starlings and House Sparrows, so you need to monitor for invasions. They say to block the entrances in offseason after the birds have left or if there has been an invasion. Also remove any nesting materials from non-Martins. I haven't had luck with our bat boxes...If you search on individual types of nest boxes (Martin, Bluebird, Batbox, etc) there is a lot of specific info on the placement, orientation to sun and water, spacing, etc. Good luck.