Animal houses are structures that provide shelter and protection for animals. Barns, zoos, CAGES, and DENS are all examples of animal houses. Barns are large structures typically used to store hay and other agricultural products, but they can also be used to house livestock. Zoos are facilities where animals are kept in enclosures and displayed to the public. CAGES are enclosed spaces used to contain animals, usually for research or display purposes. DENS are natural or artificial shelters used by animals for protection and breeding.