Aviary

An aviary is a large enclosure for confining birds, although bats may also be considered for display. Unlike birdcages, aviaries allow birds a larger living space where they can fly; hence, aviaries are also sometimes known as flight cages in the United Kingdom. Aviaries often contain plants and shrubbery to simulate a natural environment.

Large aviaries are often found in the setting of a zoological garden (for example, the London Zoo, the National Zoo in Washington, D.C., and the San Diego Zoo). Walk-in aviaries also exist in bird parks, including the spacious Bird Paradise in Singapore, or the smaller Edward Youde Aviary in Hong Kong. Pittsburgh is home to the USA's National Aviary, perhaps the most prominent example in North America of an aviary not set inside a zoo. However, the oldest public aviary not set inside a zoo in North America, the Hamilton Aviary is located in Hamilton, Ontario, Canada. Tracy Aviary is an example of a bird park within a public urban park, Liberty Park in Salt Lake City, Utah. Some smaller sized aviaries can often be found in European manorial gardens, such as Waddesdon Manor, UK, and Versailles, France. Some public aquaria, such as the Oregon Coast Aquarium, Newport, Oregon, or the Monterey Bay Aquarium, have aquatic aviaries.

Home aviaries are popular with some bird fanciers who have the space for them. Many bird breeders refer to their setups as "aviaries", since most bird pairs breed better there than in breeding cages. Home aviaries may be built by the owner or obtained from a commercial supplier.

There are two main subcategories of home aviaries: grounded aviaries and suspended aviaries. Grounded aviaries have a concrete base to keep out rats and other vermin. Suspended aviaries are elevated with only the 'legs' of the aviaries affixed to the ground, eliminating the need for a protective base. Most grounded aviaries typically feature a woodwork or PVC frame unlike the metal frame of public aviaries; however, it isn't uncommon for suspended aviaries to feature a metal frame. Aviaries are also used for research purposes in ornithology institutes.

Aviaries date back to at least the 1500s, possibly earlier, as found in the Aztec city of Tenochtitlan as noted by Hernán Cortés when he and his men arrived in 1521. Also the Raven Cage (created in 1829), is regarded as one of the oldest structures in the London Zoo.

The first large aviary inside a zoological garden was established in 1880 in the setting of the Rotterdam Zoo. Aviaries were an important aspect for the many Rothschild houses that proliferated across Europe in the 19th century. This revived a late 1600s aristocratic custom, where the elite displayed power, status and wealth by exhibiting exotic birds and animals. For instance, Baron Ferdinand de Rothschild built his aviary in 1889 at Waddesdon Manor, UK, erected in the style of Versailles' trelliswork pavilions.

In 1902, a flying cage was completed in the setting of the National Zoological Park of the Smithsonian Institution. A new Great Flying Cage was built in 1964.

The Saint Louis Zoo is home to the 1904 World's Fair Flight Cage. It is one of only two permanent structures built for the World's Fair which still remain (the other is the Saint Louis Art Museum's Cass Gilbert building). In 1904, it was the largest bird cage ever built. It remains one of the world's largest free-flight aviaries. The 69 m (228 ft) long, 26 m (84 ft) wide, and 15 m (50 ft) high cage was built by the Smithsonian Institution specifically for the St. Louis World's Fair. Local pride in the giant cage motivated St. Louis to finally establish a zoo in 1910.