Bird comes inside the box.
We have had visits to both boxes today. First Box1.
This doesn't look very welcoming! What's outside?
Another bluetit. Clearly not the first one's partner.
It is still protesting ...
... and the bird outside is still there.
Finally it goes and peace reigns again.
Now for Box2.
A typical swap-over.
No matter how often this happens, the female still seems to find it a surprise!
Another swap-over an hour later.
Again, one apparently surprised female!
This time she does a few nesting wriggles before leaving.
After this, she left and the box was empty again.