Thank you. I don't see feather loss but, instead, shortening of the existing feathers. If bullied, the birds are separated. If diet is inadequate it should be improved. Nutritional imbalances are a common cause of illness in our pet birds. What has his diet consisted of, please? Seeds should compose less than 20% of his diet. A diet of mainly seed and nuts has excessive fat, carbohydrates, and phosphorus; marginal protein; adequate vitamin E, and are deficient in amino acids, calcium, available phosphorus, sodium, manganese, zinc, iron, vitamins A, D3 (necessary for efficient absorption of calcium), K, and B12, riboflavin, pantothenic acid, choline, and available niacin. Ideally, a balanced pelleted diet such as can be found here: www.harrisonsbirdfoods.com or here: www.lafeber.com/pet-birds should be fed as well as hard boiled egg yolk, pancakes and cornbread, the tops of fresh greens, dairy products such as yogurt and cheese, fresh fruits such as apples, pears, melon, kiwi, and berries, vegetables such as broccoli, carrots, beets, asparagus, cabbage, sweet potato, and squash, and even tiny pieces of meat.
Stressors can be minimized when you can identify them - new people or pets in his area, temperature extremes, drafts, a new cage, a new location, e.g. Feeding an exemplary diet is half the battle in these birds who can become seed junkies to their detriment. There's a good chance that Kestral is going to normalize now that he's back home. I can't see the redness you're seeing. The pic is in the shadows. No worries about the time getting back to me. I'm usually chained to my computer by evil gnomes but managed to get out for a couple of hours for dinner with friends. Please continue our conversation if you wish.