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On its underside, a spider has organs called spinnerets that spin silk threads.

First, it connects two end points like two branches with silk threads, forming a bridge. It then releases a loose thread. From its center, it adds a new thread, pulling it to form a Y shape. It joins the 3 points to form a frame. Then lays radial threads till the web becomes strong enough. Finally, from the center, it spins spirally completing the web.