A pigeon enclosure is also known as a COOP, which is a four-letter word. A pigeon COOP is an enclosed structure that provides shelter and protection for pigeons. It is usually made of wood or metal and has a roof, walls, and a floor. The COOP also has perches, nesting boxes, and feeders to provide the pigeons with food and water. The COOP is designed to keep the pigeons safe from predators and the elements.