The mind boggling hunting shacks of Germany and Switzerland

This is an artistic a snap as I thought I could take of a lone hunting shack at the edge of a farmer’s field in north central Switzerland:

Oh, the fun you will have sitting warming in this shack, covered by a thick wool blanket, waiting patiently for some animal to thoughtlessly walk into the crosshairs of the telescopic sight on your rifle.

I prefer fishing.

What I’m not quite sure about is why these shacks are so predominant in Germany and Switzerland, yet in other countries are much rarer or impossible to find.