This is prime egg laying/incubation time. Over the winter a new site #4 was located, since the old one was discontinued. The owner has set up and external trail cam to catch the action out side the box, and has recorded some food transfers from the male (the food provider) and the female as she incubates the presumed eggs.
let see if the embed videos work.
First is a February defense of the box against a pesky starling. The talon thrust seems quite effective!
Next is a food delivery from 4/13/19 hopefully good things to come from this new site location!