Quote: That still doesn't mean much...Was there a tox screen? Did the blood tests show that some chemical in a potato caused some sort of poisoning that ultimately killed the chicken? Chickens (and all other animals, including humans) can die of many many causes, and no matter the cause, there are always traces of undigested food in the body.
My chickens have eaten potato peels without issue. I also assumed that animals wouldn't touch plants from the nightshade family, but mine and my friend's chickens have surprisingly nibbled the leaves of various nightshade plants without issue. Also, I pick up kitchen waste/scraps from a small local vegetarian cafe and they throw lots of avocado peel with chunks of avocado in there. There hasn't been an issue with the avocados in the compost either. To me, this just goes to show that the chickens naturally know what they can and should eat.