Agreed that a stripped off muffs/beard is not the same as feather picking or aggression. It's more likely because of overzealous grooming. Birds with muffs and beards are more prone to get food particles stuck in them and the others are picking the area clean (which tends to strip off the feathers too).
My messiest eater, which happens to be a crossbeak, gets stripped of her beard within months of it growing back in. I have other birds that retain full muffs and beard all year without issue, guess they're more tidy while eating?
My messiest eater, which happens to be a crossbeak, gets stripped of her beard within months of it growing back in. I have other birds that retain full muffs and beard all year without issue, guess they're more tidy while eating?