I have a green cheek conure (14 years old) whose wing feathers grow, then the shaft looks like it begins to atrophy and the feather breaks off at that point - on an angle. She has been like this for a few years now.
The vet I took her to said the other conure I have is over-preening her. I know this isn't true because I live with them; I watch them together all the time. He does not over-preen her, especially not her wings. Sometimes the tip of the feather looks like it curves, but then it just breaks in the weakened shaft area and hangs until I clip it off.
She doesn't like me to touch and/or try to spread her wings for a photo. She is frustrated because she is unable to fly and has taken up biting me as if it is my fault. Which may be the case.
I feed them once a day: one scoop of Zu-preem cereal and one half scoop of forti-diet seed mix. I use water dishes and clean the bio-film out when I change the water (once to twice daily). Any ideas?