When 13 bald eagles were found dead in a field, federal agents were called since the national bird is protected. At first, they couldn’t figure out what happened. Then, they learned what a farmer had done — and why he did it. Stock image (Photo Credit: Pixabay) The bald eagle is, of course, our national bird and a revered symbol in the United States, encompassing the fighting spirit of America. Unfortunately, the bird of prey was once endangered…