As the wind blows, the wings of the seagull spin independently. All hardware is easy to find or fashion. Simple to make using the FULL SIZE PATTERNS, shop notes, exploded diagram, and paint by numbers guide our plan provides. Overall size of this whirligig is about 20" square. If you'd like to build more than just one or two whirligigs, be sure and check out our Whirligig Value Packs -- we've got a great deal on 12 projects!