Chicken Run Landscaping - "She has some great info, with pictures, of what types of bushes, shrubs and flowers you can plant that are not toxic to chickens AND that they won't eat. ...because apparently, they will eat quite a few plants. She also tells you why these particular plants are beneficial to the chickens."
Boredom Busters for Chickens tasty nibbles of wheat, seeds, fruit and molasses (hence you will find it is sticky to touch). Molasses were used, according to my old poultry keeping book, in poultry feed in days gone by, and is said to help the hens digestion.