Window bird feeder

Do you live in a flat/apartment without a garden but enjoy seeing the birds? Well maybe this can help.

The uploaded version is a little different from the picture, added some extra tension triangles to help support the weight. (because yes I forgot them for myself at the most important location…)

You will need a suction knob, the one you can find on squeegees for your bathroom. 

Source file is included so you are able to change the hole size.