Here is our Mighty Eagle Total Destruction video walkthrough for Angry Birds Bad Piggies level 21-11. (If you’re looking for the 3-star walkthrough video, click here.)
Use the Yellow bird to drop the boulder being supported by a single wooden plank. Whether this is ultimately needed is not clear, as the boulder in the video was not destroyed by the Eagle. Nonetheless, fling the sardine can off of the top solid structure, causing it to fall near the just-dropped boulder. If you have an alternate strategy please feel free to leave a detailed comment below.