My husband just retrieved a plastic birdhouse from at least 15 years ago ... I brought it in, took the floor down and scrubbed the entire thing in a sink of sudsy water. There was a LOT of evidence of squirrel activity but the house is INTACT! I plan on getting more to put out for our birds, and will paint the exterior with cayenne pepper spray to deter the furry bandits from molesting/predating the little guys! Amazing quality!