It depends on where you live, what kind of habitat you have around your house, and what kind of birds you have there.
It also depends a WHOLE lot on exactly how big the opening is. If you live in the average suburbs, and have made the average size opening (“the hole”), you’re just going to get either starlings or house (English) sparrows, neither of which are considered “desirable” residents (hint: they’re “weed species” ), and neither of which species requires any nesting materials to be provided.
The only thing that keeps the sparrows and starlings out and allows the desirable species like house wrens in is the size of the hole.
So, what’s the exact diameter of the hole (to the nearest 1/8 inch), and where do you live?
Here’s some stuff to read while your kid is looking for a tape measure.