Good points about chemicals and poisons! Mechanical traps are also something to use very carefully.Our chickens loved to roam in the garden once we were done harvesting so we made sure to not use chemicals when we gardened.
Also, recently there was a distraught post from someone about their chicken getting into rat poison that had been set out. So important to keep poisons out of any place a chicken might find it. Those little dickens can get into everything!
-Kathy