This is a nesting box built a while ago. Search https://www.in.gov/dnr/fish-and-wildlife/files/fw-barn_owl_nest_box_building_guide.pdf for a better way to mount it against a wall so that racoons cannot get to the babies. This nesting box was based on this plan https://www.barnowltrust.org.uk/barn-owl-nestbox/barn-owl-nestboxes/

Here’s the Dad that finally stayed still to get a picture.

Here’s what the phone camera saw inside the box.

Mom was mad and guarded the nest for the rest of the day. This was the first time she was seen during the day.

Dinner delivery, a nice rat. Zoom in to see.

This may be the first fledgling (maybe not, but it’s a new owl of some sort). They need the shelf as a place to decide if they are ready to try flying. Their wings need to grow to about 12” which takes about 2 months in the nest.