Smart chickens weren't be duped by foul play

Smart chickens weren't be duped by foul play
http://www.int.iol.co.za/index.php?set_id=1&click_id=143&art_id=

"Chickens refusing to eat the maize they had been fed has led to the discovery that their feed had been genetically modified to include a well-known weed and insect killer."