I grow all kinds of poisonous plants. Brugmansia (hybridize these too so leave seedpods on), datura, plumeria, oleander, castor bean etc. Our poultry freerange and don't seem at all interested in eating any of this stuff. There are plenty of edibles and bugs around here so maybe they just find better stuff lol. Maybe they aren't so dumb after all. I know some of the wild birds do eat datura seed and spread it around in their droppings.My chickens walk all around and in and through them, they are all over the same area my chickens are in, no chicken has ever been hurt by them, they don't eat them at all not even a curious nibble. I do not know if the plant is or which parts may be poisonous, or if they are how (I mean some things listed as poisonous they would have to eat pounds of the stuff or the roots to even get sick other things if you take a nibble and your dead) However I do know the seeds are hallucinagenics
Brugmansia and castor bean and morning glories

