New Neighbours

I live up on the third floor in a city street, fortunately a street which has some big, beautiful trees. At the side of the house I have put up a small bird box, which has been up there for about three years now. Until this year a few birds showed an interest, but no nest. This year seems to be different though, as I seem to have a pair of Blue Tits showing a lot of interest. They have been flying to and fro for over a week now, beckoning each other, checking out safety and comfort. So maybe this year I will have some new neighbours.