I realized a bird hopping in the wood planks of our terrace roof dropping little branches. Obviously it wanted to build a nest. But the little branches always slid down to the floor when the bird flew away. So I decided to help out with a “Nest Starter Kit”: I created a bigger circle of branches and fixed it with some wire to the wooden plank.
Eventually the blackbird dropped the next material inside the circle and was able to build the nest at this spot. My family gave her the name “Marge” as her husband “Homer” doesn’t help at all.