Three weeks ago, one of our layers, one year old, began her molt and looked pretty bad per usual but then she stopped eating and even moving around was a chore for her. Our ducks are free range and while they are not afraid of us, they don't like being handled either. Two weeks went by before we finally caught her. She does not have any visible insects, ticks, fleas, or mites on her feathers, under her wings or around her vent. Her eyes and nose are clear. She has a wheeze when she breathes. We fed her extra protein (coqui frogs) and papaya. Hey, it's Hawaii. Both of these foods are treats that they dearly love. She seems over it now and is eating like a horse. Her feathers are coming back in. She lost half her body weight and now walks very stiffly. I think I will be lucky to ever get an egg out of here again. I am freaking out because another duck is exhibiting the same symptoms and she is NOT molting. Slight wheeze, drinks a lot of water, little or no movement and walks with a slight limp (imagined?), and will let us pick her up which is probably the most disturbing symptom. The only over the counter antibiotic I have access to here is Oxytetracycline. Any ideas? I have a duckling coop I can isolate her in.