Please help.I have seven royal palms all approaching five to six months of age.They free range all day and roost at night.All of them are losing feathers on the back of their necks only.They have all the food they can eat.Mealworms,sun flower seeds, high protein crumbles .The grass is brown now and I haven't been supplying greens.Unsure if I should.Their behavior is the same and they don't act sick.