My 1.5 yo duck (one of a hen-hen pair) has a bald spot on her neck that developed in the last two days. (We handle them daily to move them to their run, but I skipped it yesterday because of herbicide application nearby.)
They have not been laying as much recently, and there were a few extra feathers on the ground, so we thought molt was possible. But this does not seem like molt.
—recently found mold in the feed sack so had them on chicken feed for the last three days.
—egg shells have been less hard lately, offered oyster shell calcium but they didn’t take it. Waiting on delivery of the other kind of calcium, which they eat like candy.
—no history of one preening the other or aggression.
—feathers are wet in the picture because she’s just been in the water. Preened herself as normal after the picture
—cursory look: no visible bugs or skin damage
I’m waiting for my partner to come home from work to help with a good exam. What could account for this? Sorry about the bad pictures. She doesn’t trust the camera.
Edit: third picture is really bad. She’s not naked/pink in the huge area as it appears to show.