Farm structures are essential for the success of any agricultural operation. PENS, silos, sties, and barns are all common farm structures that provide a variety of functions. PENS are typically used to contain animals, such as livestock, while silos are used to store grain and other dry goods. Sties are small structures used to house chickens and other poultry, while barns are large structures used to store hay, tools, and other equipment. All of these structures are necessary for the efficient running of a farm.