DIY Streaming from a Birdbox with Raspberry Pi
This is a pretty good sign that this female is interested in building her nest here. Notice the point at the front of her cap and the slight joining of the cap to her body colour at the back of her head. This is how we differentiate between the different birds that visit.
The box had had a male bird roosting in it for a number of weeks and a large ring of dried droppings had formed, thoroughly stuck to the floor. We had a number of storms with high winds and during this period the male stopped roosting. I took this opportunity to take the box apart and clean it out. A few days later this female visited for the first time. She had been on the outside of the box pecking at the hole a number of times before entering.