The male is in charge of building the nest. There is a lot of effort put in to collect the right strands. And then they are weaved together to form the structure. Different kinds of complicated knots are used while building the structure. The small sparrow like creatures use primarily their sharp beaks to cut the twins into the right sizes and then to weave it into this inverted pot like structure.
Trust me, these structures are amazingly strong. I have personally seen these withstand the strongest of winds... without any damage. The female inspects the nest before pairing with the male. Once the female is pleased with it, the male completes the long snout like entrance, sometimes with help from his new partner.
To understand how complicated this can be for the small bird, try to weave a basket. It is difficult isn't it? Unless you are a weaver, you may find this task challenging. To those who say this is easy, try doing it using only your mouth. Yet, these creatures who have never been trained build something that will put even the most proficient architects and builders to shame.
Look around. God has placed so many miracles around us. Let us appreciate these one by one.