Entrance openings - Wilnest Birdhouses

Which bird species will nest in your Wilnest bird house, is mostly dependant of the size of the entrance opening. Thanks to the exchangeable slides supplied with the Wilnest, you control that yourself.

An overview of the possible openings and the associated bird species:
28 mm: blue tit,
Oval (32 x 52): spotted flycatcher
35 mm: house sparrow, nuthatch, pied flycatcher, great tit
40 mm: tree sparrow