Ancona ducks 9 wks old on monday june 28 symptoms: since perhaps 7 wks of age, noticing more and more white feathers all over the place. one of the birds has no more feathers on underside of neck and down the front and to the belly. just white fluffy down and yellowish-white feathers beneath, trying to emerge i guess. some of the other birds manifest lesser symptoms, having feather loss on front of neck and upper breast, again with yellowish white colored feathers beneath. never encountered parasites before. i examined the worst case, a drake. i could see some little line-shaped things in his down, but not many. i may have seen one move, but i couldn't see much. may need mag. glass. i don't think this is normal. the problem seems to be confined to the front of the birds. i noticed nothing around the vent and there are certainly no bare spots. birds have access to pool daily. however, i admit that for reasons i can't go into, the pen they were in for about 3 to 3.5 weeks got pretty dirty with poop. it was shady and damp at times. any thoughts on this. but the white feathers are all over...........!