 Owner and veterinarian Emily Carrington began training hens with magnetic letters and numbers last year. Their job was only to peck the number of letters, but I taught them to peck and ignore the other ones, Carrington explained. Their hard work recently paid off as one hen, Lacey, managed to set the Guinness World Record for the most identifications by a chicken. Setting the bar low, Carrington documents her hen highlights on her YouTube channel, The Thinking Chicken. Oh, my God.