A backyard structure is an outdoor structure that can be used for a variety of purposes. Common backyard structures include a FEEDER, a tool SHED, a DECK, and a SHED. A FEEDER is a container or device used to hold food for animals, such as birds. A tool SHED is a small building used to store tools and other equipment. A DECK is a flat surface, usually made of wood, that is attached to a house and used for outdoor activities. A SHED is a small building used for storage or as a workshop.