General terms:
* Enclosure: This is the most general term and can refer to any type of structure designed to contain animals.
* Habitat: This term emphasizes the natural environment that the enclosure is trying to recreate.
* Aviary: This specifically refers to an enclosure for birds.
* Vivarium: This refers to an enclosure for reptiles, amphibians, or invertebrates.
* Terrarium: This specifically refers to an enclosure for reptiles and amphibians.
* Aquarium: This refers to an enclosure for aquatic animals.
Specific terms:
* Cage: This is a small, enclosed structure typically used for smaller animals like birds, rodents, or reptiles.
* Pen: This is a larger, open-air enclosure, often used for larger animals like pigs, goats, or horses.
* Tank: This is a large, water-filled enclosure used for fish and other aquatic animals.
* Zoo exhibit: This refers to a large, complex enclosure designed to showcase animals in a natural setting.
* Sanctuary: This is a protected area where animals are rescued and cared for.
The best term to use will depend on the specific context.