Already in February, the birds started to inspect the nestingboxes. We do have 7 nesting boxes with live images from inside and outside this year. Box 2 is not shown this year, they are occupied by sparrows already.
Nesting Boxes Live inside / outside and Diary 2006
Also made for Blue tit, they looked once, but most of the time sparrows and great tit tried to get their head in. Therefore we changed the flight hole diameter and made it 28 mm for great tit. See Diary , live outside and live inside