A domestic cat enclosure (or cat cage or catio as portmanteau of cat and patio) is either a permanent or a temporary structure intended to confine a cat or multiple cats to a designated space for the cat to experience the outside. Some cat enclosures have a secondary function of ensuring the cat's safety by keeping other animals out, such as predators of cats (coyotes, wolves, etc.) or the safety of other smaller animals like cat prey (birds, mice, etc.). Enclosures may be constructed in either an indoor or an outdoor environment.