Birds--General/Mutant pin feather?
My friend has a parakeet with what seems to be a mutant pin feather. She tries preening, but the feather remains thick and never really grows out. She took it to a vet, but wasn't given much advice. Is this something you have heard of before, and what advice do you have for her?
My own parrot had the same thing, I believe the feather eventually fell out and grew back in normally. I would have to defer to whatever little advice the vet gave, but I would advise your friend to just leave it be! Pulling it is too risky, as you could permanently damage the feather follicle.