Animal housing is a term used to describe the enclosures, shelters, and other structures used to house animals. ZOO (3 letters) and Zoos (4 letters) are two common types of animal housing. A ZOO is an enclosure where wild animals are kept for public display and entertainment. Zoos typically contain a variety of animals from different parts of the world, and often feature educational programs and activities. Zoos also provide a safe environment for endangered species to breed and thrive.