I was on pinterest today and stumbled onto a site I've never been on. Long story short, I honestly believe I finally found out what happened to charlie, my recent duck who passed. Anyway, hardware disease, aka heavy metal poisoning, lead, zinc, copper, etc. Eating nails, metal, etc and it slowly poisons them and eventually death. My hubby works on houses, carpenter, roofing, etc so there's always stuff lying around. Charlie was a nebshit and always snooping on his tool shelf and through this work stuff. My hubby also shoots guns constantly, its his hobby, she always would wonder over by his targets so shells, pellets, etc. All causes. She had almost every symptom listed. I know that's it. And now my husband feels responsible for her death but he's being a lot more careful!