My flock free-ranges with supplemental feed of brewery grain and mash (mash especially for the winter, a 20% protein). All summer, everyone grew well and packed on the pounds. The pekins never really ate supplemental feed, only once in awhile, they'd come in to hog down feed. This morning, I left them all out and had a duck down. I brought her in and checked her over. She's shaking, has a little bit of something in her crop (feels like some corn from the field), but I brought some warm mash and water to her and she's not touching the mash. She is drinking, but not eating. I felt through the feathers, and she literally has no meat, she's ALL bone. I don't understand at all. They were all out rooting around in the dirt yesterday, the feed bucket ALWAYS has some food left in the morning (I leave a light 24/7, which is just enough for them to see). When I open the doors, they're eager to "escape" and get out into the fields. I haven't checked the other ducks yet, but at I did drag them all back for the warm mash, to make absolutely certain that they were eating. Why then, is at least one hen starved half to death, when they have food provided and accessible? Everybody else looks excellent, great broad breasts on the dozen cornish cross and the two BBW turkey hens, the boy turkeys are somewhat boney, but I believe that to be the royal palm in them (and the idiot BBB/Royal palm tom who foregoes food for sex). None of my layers are boney, they all have some meat on their bones. Do I need to start locking the ducks up, to "force" them into eating mash without getting all the exercise?! I would think worms, but nobody else seems to have any problems.