That's a pheasant back, or Dryads saddle. Not poisonous, can taste pretty good. You can trim the freshest edge and it will fry up and be pretty tasty. The smaller they are, the more you can take, but on the biggest one in your pick you'll only want to take about 1/2" of the outer edge, but after that it's tougher than shoe leather. After you've done it once you'll be able to tell how much to take.