Many North American birds rely on tree cavities to raise their young — but natural nesting holes are disappearing. Learn which birds use nest boxes, why correct dimensions matter, and how one simple wooden box can support generations of songbirds. Includes a free printable nest box size chart.

Where should you hang a nest box? How big should the entrance hole be? Are gourds better than martin houses? Learn the essential nest box facts that help cavity-nesting birds stay safe and raise successful broods in your backyard