Here you can see a nesting aid for birds. It can be made from thin reed, which is the best. Just bend it into shape and fix it with cord. Thorns can be easily tied around. It is as a defense against predators. - To install every year from november till february. This nesting aid is placed on a facade between sewage pipes next to the Galeriepassage in Basel. The exhibition ended in October, but the support remains. //They who browse around can take a peep into the nest. nesting aid to install every year from november till february