Come and see the birdhouses I’m making. They are themed and this one is Fern and Flowers. The next one is Shabby Chick. So far, I have 20 or so designs. Some are tall and others are itty bitty. This has a two inch opening but others will be from 1 1/2″ to 3″. There is a chart that tells you how big the box, hole, and depth need to be for different bird species.