Feathers Turning Black
I have a 5 year old Sun Conure whose yellow feathers on her nape and some of the smaller feathers on top of her wings on both sides have turned from yellow to half dark grey-black, the bottom half of the feathers.
I never noticed it before so I'm pretty sure this is a recent occurance. Also she has some black spots on the outer edges and some throughout some of her wing and tail feathers which the vet said looked like stress marks but didn't say anything else about it, however the yellow-black change in the nape and upper wing area has me concerned.
I am curious what has caused the nape feathers to turn dark-grey to black and what can be done to correct this or if this is any indication of disease? She has recently had her diet changed from mostly seeds to Harrison's high potency fine.