Those bluebird feeders with a one-and-a-half-inch entrance hole seem like a great way to offer supplemental foods like mealworms and raisins while excluding invasive European Starlings and other large birds from gobbling up all the expensive fare. But do they really work? Well, have a look for yourself…
There you have it. Feeders like this one are available commercially, so you don’t have an in-house wood butcher to get one. We’ve heard a rumor that Santa makes them too!