Bluebird Nest Lift
Simple but innovative nest lift deters parasites.
Keeps nests raised, dry and safe! Place the Nest lift in the bottom of a bluebird house, or any birdhouse. Helps control Blow flies, parasites, and other nesting problems. The Nest Lift helps ensure more viable eggs hatch and thrive.
Measures: 4 x 4 x 1
Have not used this yet..but...
I think it could be invaluable to a bluebird nest! Would keep the nest dryer and resist ants and blowfly infestations that occur quite often in bluebird boxes.