Yes the wings being split is normal...2 wings. Are you sure they don't look eaten? I can't tell for sure but the pic on the right looks like it's tail end is not all there. Other possibilities are not enough to drink as in water crystals or fresh carrots or apples. Another reason, mold. If you let the fruit rot and mold it will kill your bugs. I don't have experience with this but info everywhere says this is true. I have been adding unmedicated chicken feed to my substrate and they seem to like it. Is it possible the bins have been contaminated with a pesticide or something? I don't know, just grasping at straws here.