Stella, my 9 year old Mallard mix, has had loose feathers for well over month or so. She's NOT molting, but losing a fair # of pin feathers and larger feathers this week, probably about 10 to 15 feathers a day, maybe more. It's enough to be noticeable in the yard. Doris, her younger friend, seems fine. I thought it might be lice (I've never had to treat my ducks), so I got some dust and did both ducks even though there were no signs of lice or eggs on either. Stella seems to be eating a bit less too and is pickier about her food. I started some ACV yesterday. Does anyone have any ideas? Are there any safe vitamin supplements for ducks? Thanks for any ideas.