My blue swedish duck has very little down on her back. Her feathers themselves seem worn too but wondered if that were at one point from the drakes and will probably be like that until the next molt. I don't think though that right on top of her back could be the boys though cause usually the work away feathers would be more towards the sides. I can see most of her back (skin) and she has hardly been mated at all lately so I'm wondering what it could be. Her back seems clean, no black spots indicating typical mites. She's eating and drinking fine, foraging, etc. I'm wondering about worms but don't have the funds right now to get her tested. Her eggs look fine. What are some other possibilities? Is she gonna be warm outside through the night in the coop without these feathers?