Anyone ever done the chicken and shot test? You need one chicken, any breed will do, and one lead shot pellet. Drop the pellet right in front of the chicken, they will often seize it in mid air, or, pounce on it when it hits the ground.
Then, they will spit it out. Every, single, time.
Nobody has ever been able to explain to me how a domestic chicken can recognize that a lead shot is not food, or, grit, but, wild birds are supposedly eating lead shot.

Best,
Ted