According to the wiki you can find chicken in the following places: Sabrehaven, Rookgaard, The McRonald's Farm in Thais, Northport, Fibula, Greenshore, Krimhorn, Femor Hills, Orc Fortress, Factory Quarter, also there's one in the farm near Edron.
Edron (Stonehome Village), took some screenshots for you, see red arrow in minimap below: