Toxic food for chickens

[CherishedFowlGuardian]

What are all the food and plants that chickens can’t eat?
I realize that we don’t have a toxic food tread so here it is please let me know all the things a chicken can’t eat.

 

[Icemaiden]

My flocks always seem to know what they shouldn't eat, apart from the occasional nibble at a stinging nettle leaf...