[2016-04-09 Update]

After checking it for a couple of weeks, on 2016-04-07 a pair of Blue Tits moved into the box and has already build an impressive nest. They’ve collected tons of hair from the neighbor’s dogs and cats.  Their nest is already pretty comfortable, so that the female is spending the night in it. I’m looking forward to spotting the first egg …

[2016-03-17 Update]

… an it seems that  they are really impressed by having a Raspberry Pi under the roof.