Delaware State Bird Blue Hen Chicken TeeDelaware State Bird Blue Hen Chicken Tee Delaware's state bird isn't a wild bird at all the Blue Hen Chicken earned its place through Revolutionary War legend, when soldiers from Delaware carried blue hen fighting cocks into battle and became known for their ferocity. The Blue Hen became the University of Delaware's mascot, a symbol woven into Delaware identity at every level. These steel blue birds are striking in person, with iridescent feathering