the starlings already inhabited in my nesting box

On March 2 I posted a post about installing bird nesting boxes. I wondered if and what birds will settle them. According to the central construction, the box was designed for starlings. This spring spotted we have very early, because already 26 February. Already after two weeks the pair of starlings got acquainted with the new apartment and every morning from early morning it is singing their melodies. I watched the arrival of other starlings and the defense of the new home. It will be nice to observe when the breeding season begins. At about 20m the other 2 couples searched for cracks in an old building for nesting.