Ok, so here, I have taken the razor blade and sliced down through the skin along the sternum, across the belly, and to the cloaca (where my tweezers are). I am looking here for the bursa, which, depending on the structure, helps determine the relative age of the bird. All of those little tiny grains of stuff? that is sawdust used to soak up blood and ooze and slime, and gives my fingers some purchase on the skin.