Each bird would need to consume nothing but raw potato skins all day to get enough to hurt itAvocados, onions, chocolate, onions, citrus fruits, white potatoes (contains solanine which lowers red blood cell levels. Even boiling them reduces very little of this chemical), and apple seeds.
I see references of bread, pasta, and rice mentioned as being commonly given to birds. Where that may not be toxic to birds, it certainly is of little nutritional value, and too much can certainly block the crop because it isn't easily digested. Where chickens may be omnivores, they are not garbage disposals for what one chooses to throw out. Unless someone prefers to nurse or cull sick birds.
I see this same behavior with people who have overweight dogs. They buy numerous treats and feed them to the dog in addition to giving too much food. They think it is fun, cute, or making up for some guilt, until they see their vet bills.
I thought you knew something truly POISON
Just because foods contain small amounts of toxins doesn't mean they will actually cause harm in the small amounts normally consumed by healthy birds
Nothing after the first sentence has anything to do with toxic foods