For weeks, one of my two nest boxes, namely the one with the 50mm entrance hole, has been visited daily by a starling.
But for two days now, a great spotted woodpecker has also taken an interest in the box.
After a careful look through the entrance hole, the interior of the box is also subjected to a closer inspection.
Thereby the interior has to withstand the intensive knocking test.
However, I am a bit afraid for my camera during this inspection method.

With a bit of luck, the woodpecker will remember the box as a potential nesting cavity and we will be able to watch little spotted woodpeckers grow up next spring.
Would definitely be something different…