Giraffes (Giraffa camelopardalis) in Sydney's Taronga Zoo in 2002.

Collections of wild animals existed already in the ancient civilizations of Mesopotamia, Egypt, and China. In medieval Europe some monarchs, monasteries, and municipalities continued to maintain collections of wild animals. The transition from menagerie, a predominantly private collection, to public institution marks the beginning of the modern zoo concept. Collections established during the nineteenth century began calling themselves zoological gardens. Throughout the nineteenth and twentieth centuries, many new zoos and related facilities were founded for very different motives and purposes.

Zoo professionals proclaim demanding aims for their institutions, from educating the public to conservation of biodiversity. Many zoos define their aims as recreation, education, research, and conservation. Animal-rights groups claim that there is a wide gap between these claimed aims and actual practice, and that zoos have commercial and entertainment purposes in mind as well as financial profit.

Types of zoo include urban, open-range, safari, animal theme, roadside, rescue, sanctuary, petting, and specialized. The most traditional form of maintaining wild animals in captivity is keeping them in cages constructed of concrete or metal, in aviaries, or fenced paddocks. Most zoological gardens incorporated within international umbrella organizations are led by professionals such as zoologists or veterinarians.

Etymology

The terms zoo and zoological garden, that refer to zoology (from Greek: z??, zoion, "animal"; and ?????, logos, "knowledge"), did not come into use until the modern zoo concept developed during the nineteenth century. The Zoological Society of London first used this term to describe its collection at Regent's Park, although this collection was simultaneously referred to as a menagerie. Most zoo founders of the nineteenth century operated with the term zoological garden to distinguish their institutions from the aristocratic and travelling menageries. The abbreviation zoo first appeared in Britain about 1847, when it was used for the Clifton Zoo, but it was not until some twenty years later that the shortened form became popular by a song called "Walking in the Zoo on Sunday".^[1] Relatively new terms for zoos, which were coined in the late twentieth century, are conservation park or biopark. Adopting a new name is a strategy by some zoo professionals to distance their institutions from the stereotypical and nowadays criticized zoo concept of the nineteenth century.^[2]

History

From ancient to modern times

The Versailles menagerie during the reign of Louis XIV.

Giraffes at Tiergarten Schönbrunn in Vienna, the former Habsburg menagerie.

Also in the ancient Greek and Roman world live animal collections existed. Historians have written many publications about extravagant and bloodthirsty spectacles in Rome, involving wild animals. However, little has been written about the facilities of keeping those animals.^[5] The Latin word vivarium referred to the stockyards and arenas where wild animals were held for public spectacles.^[6]

The monkey cage at London Zoo in 1835 (Lithography by George Scharf).

Evolution of the modern zoo concept

Evolution of the modern zoo concept

In the United States, physician William Camac initiated the incorporation of the Zoological Society of Philadelphia in 1859. According to the society's charter, "The object of this Corporation shall be the purchase and collection of living wild and other animals, for the purpose of public exhibition at some suitable place in the City of Philadelphia, for the instruction and recreation of the people."^[12] The American Civil War interrupted these efforts so that the opening of the Philadelphia Zoo delayed until 1874. Some years ago, the Central Park menagerie evolved from gifts of exotic pets and other animals informally given to the Park, beginning, apparently, with a bear and some swans deposited near New York's arsenal on the edge of Central Park in 1859. ^[13] About 1861/62, a smaller zoo with lower standards had been already established in New York City, the Central Park Zoo.^[14] In 1864 it received charter confirmation from New York's assembly. When the first American zoological gardens came into existence, only a few supporters of the early animal welfare movement spoke out against zoos. Humanitarians protested cruelty in training animals for circuses more often than they opposed zoos. Their concerns were that zoo animals were healthy and well cared for, and not subjected to cruelty or pain.^[15]

Throughout the nineteenth and twentieth centuries, many new zoos and related facilities were founded for very different motives and purposes. Cultural and philosophical attitudes as well as political developments such as imperialism had an impact on the appearance and aims of zoological gardens. Human beings were sometimes displayed in zoos along with non-human animals, supposedly to illustrate the differences between people of European and non-European origin (?Human zoos?).^[16] According to historians Eric Baratay and Elisabeth Hardouin-Fugier the zoos of that period reflected the determination of imperialist nations to classify and dominate.^[17]

When ecology emerged as a matter of public interest through the 1970s, a few zoos began to consider making conservation their central role, with Gerald Durrell of Jersey Zoo, George Rabb of Brookfield Zoo, and William G. Conway of Bronx Zoo leading the discussion. ^[18] Since then, zoo professionals became increasingly aware of the need to engage themselves in conservation.^[19]. The changes at zoos have served both the ideology of environmentalism and the day-to-day needs of zoos to maintain their collections. Many of contemporary zoos led by professionals show fewer species and display social animals in groups; landscape immersion exhibits replicate animal habitats.^[20]

Aims

Entrance to Tokyo?s Ueno Zoo (Japan), established 1882.

Sleeping California Sea Lion (Zalophus californianus) at Berlin Zoo.

Gray wolf (Canis lupus) at Skandinavisk Dyrepark, Denmark.

A Sumatran Rhinoceros (Dicerorhinus sumatrensis) wallows in the mud at Cincinnati Zoo.

Recreation

Recreation, which is close to entertainment and pleasure, does not benefit the welfare of the zoo animals, but that of the zoo visitors. Jamieson points out that "we should have the honesty to recognize that zoos are for us rather than for the animals".^[25] According to Swiss zoologist Heini Hediger recreation is one of the most important aims of the modern zoo in the face of proceeding urbanization and alienation from nature. People, especially from urbanized areas, should be given the opportunity to relax and to enjoy a naturalistic environment in their very neighbourhood.^[26]

Education

Since the beginning of the modern zoological gardens education and therefore the propagation of biological knowledge has been one of the most prominent aims claimed by zoo professionals. Already in 1829, London Zoo published its first guide to the zoo.^[27] Today?s educational efforts of zoos concentrate mostly on ecological and conservation issues. The idea of conservation education at zoos has a longer history than it is often acknowledged. This idea was foremost among the goals of the Arizona-Sonora Desert Museum as it was planned in the early 1950s. Animal exhibits were one component of the museum, which was begun with the goal of educating the public about the plant life and scenic value of the desert. Although the museum's focus was regional, and it was not a traditional zoo, directors of many American zoos looked to it as a model.^[28] Many zoos now have an education department, a classroom, and full time educational officers. Edinburgh Zoo has pioneered a scheme called "interlink" which combines the resources of the zoo, local museums, and the botanical gardens to create educational courses. Like several other zoos it offers teachers a range of courses from day trips with infants to intensive courses for advanced students. In 1991, over 50,000 students were involved with structured courses at Edinburgh Zoo.^[29] However, critics say that there is no educational value in exhibiting wild animals in artificial environments. According to them true respect for wildlife could only be stimulated by learning about animals in their natural habitat.^[30]

Przewalski's Horses (Equus ferus przewalskii) at Prague Zoo (Czech Republic), part of an international captive breeding program.

Research

Classical zoological gardens played a role in research in comparative anatomy and physiology in the nineteenth century.^[31] Contemporary research efforts focus on ethology and conservation breeding. According to William Conway zoo science would contribute basic biological information and technological know-how to the increasingly demanding tasks of wildlife care in constricted habitats.^[32]

Giant Panda (Ailuropoda melanoleuca) at Smithsonian National Zoological Park.

Conservation

Oregon Zoo maintains a successful breeding program for Asian Elephants (Elephas maximus).

Tiger at New York's Bronx Zoo, one of the first that made conservation its major aim.

But critics point to the marginal contribution of zoos to the preservation of biodiversity. Andrew Linzey, director of the Oxford Centre for Animal Ethics, argues that zoos make a "minuscule contribution to conservation."^[39] Most conservation experts agree that few of the rare or endangered species can be saved from extinction by breeding them in captivity. In 1990, the International Union for the Conservation of Nature (IUCN) drew up an action plan for the survival of 1370 species. It considered that the reintroduction of captive bred animals could assist in the conservation of only 19 species (1.4 percent).^[40] How controversial ex-situ conservation is, shows the captive breeding program for the critically endangered Sumatran rhinoceros. Between 1984 and 1996, 40 Sumatran Rhinos were transported from their native habitat to zoos and reserves across the world. After years of failed attempts and a dramatic decline of the captive population, one individual gave birth to a healthy male calf at Cincinnati Zoo in September 2001. This was the first successful captive birth of a Sumatran Rhino in 112 years. Two other calves followed in 2004 and 2007. Despite the recent successes in Cincinnati, the captive breeding program has remained controversial. Proponents argue that zoos have aided the conservation effort by studying the reproductive habits, raising public awareness and education about the rhinos, and helping raise financial resources for conservation efforts in Sumatra. Opponents of the captive breeding program argue that losses are too great; the program too expensive; removing rhinos from their habitat, even temporarily, alters their ecological role; and captive populations cannot match the rate of recovery seen in well-protected native habitats.^[41]

Types

The "Ocean Voyager Tunnel" at Georgia Aquarium, Atlanta.

The African plains exhibit at North Carolina Zoo illustrates the dimension of an open-range zoo.

Giraffes being fed by visitors in the West Midlands Safari Park

Spacious walk-in aviary at Jurong BirdPark in Singapore.

Butterfly zoo ("Monsanto Insectarium") at Saint Louis Zoo.

Urban zoos

Urban zoos are the classical zoological gardens that stand in the tradition of the nineteenth century zoo concept, even if some of them changed their names to Conservation Park or Biopark. Most of them are relatively small in size and based within cities or urbanized areas, a fact that often complicates the construction of more sizable enclosures. In Europe a famous urban zoo is the Antwerp Zoo in Belgium, right next to the central station of the city.

Some zoos concentrate on animals of geographical regions (geozoo) or attempt to exhibit their animals in a different way of the opening by night (night safari).

Open-range zoos

A number of open-range zoos have been established since the early 1930s in rural surroundings. The prototype is Whipsnade Park, England, established by the Zoological Society of London in 1932 (600 acres, 2.4 km²). Fewer species are exhibited in such zoos than in urban zoos, but they are mostly kept in more sizable enclosures. The largest zoo in terms of size is the 1,800 acre (7 km²) San Diego Wild Animal Park in the Pasqual Valley, California, that is run by the Zoological Society of San Diego. The Werribee Open Range Zoo near Melbourne, Australia, concentrates on displaying animals living in a wide open savanna. This zoo is managed by the Zoological Parks and Gardens Board which also manages Melbourne Zoo. One of only two American state supported zoos is the North Carolina Zoo located in Asheboro, North Carolina.

Safari parks

A safari park is a zoo-like commercial tourist attraction where visitors can drive in their own vehicles and observe the wildlife, rather than viewing animals in cages or small enclosures. Most safari parks were established in a short period of ten years, between 1966 and 1975.

Animal theme parks

An animal theme park is a combination of an amusement park and a zoo, mainly for entertaining and commercial purposes. Marine mammal parks such as Sea World and Marineland are more elaborate dolphinariums keeping whales, and containing additional entertainment attractions.

Another kind of animal theme park is Disney's Animal Kingdom in Orlando, Florida (550 acres, 2 km²) or Busch Gardens Africa in Tampa, Florida (335 acres, 1.34 km²). These commercial parks are similar to open-range zoos according to size, but different in intention and appearance since they contain far more entertainment elements (stage shows, roller coasters, mythical creatures etc.).

Roadside zoos

There are hundreds of substandard wildlife attractions throughout the United States and Canada called roadside zoos. These mainly amateur facilities are usually privately owned and occasionally accredited by the American zoo organization AZA. The focus is on amusing customers, rather than on meeting the needs of the animals. Roadside zoos often lack trained, experienced animal care staff, proper funding and safety practices. Animals are confined to small, barren, often filthy cages, and suffer poor welfare as a result of inadequate housing, care and diet. Roadside zoos breed animals in order to have a constant supply of cute babies to attract the public. Big cat rescues, primate rescues, and native wildlife rescues are overwhelmed due to the constant influx of animals coming out of roadside zoos.^[42]

Rescues and sanctuaries

Animal welfare supporters have funded the construction and set-up of sanctuaries for wild animals. The animal welfare organization WSPA established several of these facilities for rescued bears worldwide. According to the organization those in Greece and Turkey have helped stamp out the tradition of forcing bears to perform tricks for public entertainment.^[43] Another type of sanctuary takes the form of a rehabilitation and release center. An example of this is the Idaho Black Bear Rehabilitation Center, where orphaned bear cubs are cared for and prepared for release back into the wild.^[44] Another sanctuary, especially for apes and primates, is 65 acre (0.26 km²) Monkey World near Wool, Dorset, England. Set up in 1987 it was originally intended to provide a home for abused chimpanzees used by Spanish beach photographers, but is now home to many different species of primates.^[45]

Petting zoos

A petting zoo, also called children's farms or children's zoos, features a combination of domestic animals and wild species that are docile enough to touch and feed. To ensure the animals' health, the food is supplied by the zoo, either from vending machines or a kiosk nearby.

Specialized zoos

Some zoos specialized on specific groups of animals such as bird parks (public aviaries), reptile zoos (reptile centre, serpentaria), public aquaria or butterfly zoos.

Exhibitry

African Panorama exhibit at Tierpark Hagenbeck constructed at the beginning of the twentieth century.

Landscape immersion as on this picture (Wuppertal Zoo, Germany) allows a small impression of natural habitats.

Traditional enclosures and new approaches

The most traditional form of maintaining wild animals in captivity is keeping them in pits, cages constructed of metal bars or concrete, in aviaries, or fenced paddocks, although many zoos replaced these by more elaborate and spacious enclosures that attempt to replicate their natural habitats, for the benefit of the animals and the visitors. ^[46]

German merchant Carl Hagenbeck developed a new form of animal exhibition at the beginning of the twentieth century. When he opened his private owned zoo at Stellingen near Hamburg, (Tierpark Hagenbeck) in 1907, Hagenbeck had broken with a strong tradition to exhibit animals in accordance with taxonomy. He created a new style of exhibition based on ecological and geographical habitats including different species. For example, the "Northern Panorama" exhibited seals and walruses in a pool in the foreground, with reindeer behind them, and polar bears behind the reindeer. In the "African Panorama", the foreground pond had ducks and flamingos; behind them were large plains with zebras, antelopes, and ostriches; behind them were lions and vultures at the foot of an artificial mountain, on which were ibex or barbary sheep. The different enclosures were divided with moats not visible to the public, and the successive enclosures were higher than the one in front. The exhibits were landscaped with plants and artificial rocks. The artist for the artificial rocks was Urs Eggenschwyler. This gave the public the impression they were seeing the animals together in one natural habitat. After initial skepticism, many zoological gardens throughout the world adopted Hagenbeck's ideas and replaced traditional enclosures. Edinburgh Zoo, for example, was one of these institutions inspired by Hagenbeck?s new design.^[47] Even if this kind of exhibiting animals to the public was revolutionary in the history and evolution of zoo design, the actual space provided to the animals remained relatively small and was, in fact, not different from that of the traditional enclosures. The new panoramas benefited the aesthetic sense of visitors and can be seen as mainly anthropocentric constructions.

During the 1930s, some attemps were made to introduce abstract design into the modern zoo architecture. London Zoo's penguin exhibit designed in 1934 by Berthold Lubetkin and the Tecton Group was a icon of the Modern Movement with its sweeping, interlocking concrete ramps above the pool. ^[48]

From the 1950s on, first attempts were made to integrate the behavioural needs of the animals into zoo design. This approach based on the ideas of Swiss zoologist Heini Hediger who published his book Wild Animals in Captivity in 1942, translated into English in 1950.^[49] In this work he gave cogent arguments for a biological and particularly behavioural approach to zoo design and animal care.^[50]But the attempts to integrate the knowledge about animal behaviour into zoo design were often ineffectual and not consequently implemented. More important than behaviour and welfare of the animals remained hygienic aspects and, above all, architectural innovation such as New Brutalism. The Elephant and Rhino Pavilion at London Zoo, designed by Hugh Casson and built 1962-1965, is such an example. Most enclosures constructed from the 1950s to the 1970s were sterile and small cages made of concrete or ceramic tiles.^[51] Meeting hygiene standards became important which resulted in enclosures resembling bathrooms. Few zoos adopted these techniques of "sanitary modernist" design more thoroughly than the one in America, Philadelphia Zoo which opened exhibits Carnivora House in 1951, Monkey House in 1958 and Rare Animal House in 1965. ^[52]

Due to limited space and a lack of financial means it still remains difficult to construct adequate enclosures, particularly for large animals and their requirement for a sizable territory. According to animal rights groups, zoos lacking the financial means or the interest in constructing more elaborate enclosures still keep their animals in inadequate conditions.^[53] These conditions can cause stereotypic behavior.^[54]Elephants in zoos can also often suffer from arthritis and foot disease. Only some zoological gardens are able to raise enough funds and have sufficient space to build more adequate enclosures for these animals. Such an example is urban Cologne Zoo, Germany, which opened in 2004 an indoor and outdoor elephant enclosure of about five acres.^[55] In 2006, three American zoos (Lion Country Safari, Philadelphia Zoo, Gladys Porter Zoo) announced the closure of their elephant exhibits due to a lack of space. Two other zoos, Bronx Zoo and Santa Barbara Zoo, announced the phase-out of their elephant exhibits.^[56]

Landscape immersion

During the 1980s many zoological gardens, first in the United States, changed their policy of designing animal enclosures. The so called "landscape immersion", a term coined by Seattle architect Grant Jones, transformed visibly the outlook and appearance of many zoos throughout the United States. The idea and concept of landscape immersion combines a naturalistic and realistic imitation of natural habitats with the environmental needs of the animals. It was developed by several landscape architects during the wholesale renovation of Woodland Park Zoo in Seattle in the late 1970s encouraged by zoo director David Hancocks. The first landscape immersion exhibit, an enclosure for gorillas, designed by Johnpaul Jones, opened in 1978 at Woodland Park Zoo. For the first time, zoo gorillas had trees to climb, places to hide, a complex landscape to explore, and live vegetation to interact with. According to the original idea and philosophy of landscape immersion the visitors are given the sense they were actually in the animals' habitat. Buildings and barriers are hidden and vegetation plays a dominant role.^[57]

Specific forms of exhibit that can also be referred to landscape immersion are walk-through enclosures and walk-in aviaries. A few European zoos had already realized such exhibits before the term landscape immersion was coined. These ideas were integrated into the concept of landscape immersion and consequently advanced. In contemporary zoos, there are a lot of walk-through exhibits where visitors enter enclosures of non-aggressive species, particularly for birds and small primates. Visitors are asked to keep to paths and avoid showing or eating foods that the animals might snatch. The animals are not tame. One example is Apenheul Zoo, Netherlands, where visitors can get into direct contact with squirrel monkeys and lemuridae on moated islands.^[58]

Associated with these changes of zoo design are large tropical indoor exhibits. Bronx Zoo?s Asian rainforest "Jungle World", opened in 1985, is a pioneer exhibit of its kind.^[59] Leipzig Zoo, Germany, is currently building a similar, but more giant project, the so called "Gondwanaland".^[60] The transformation of zoos according to the concept of landscape immersion is slow and still in progress since the changes require extraordinarily financial and technical expenditures.

Special enclosures

Zoos may have special buildings for nocturnal animals, with dim white or red lighting used during the day, so the animals will be active when visitors are there, and brighter lights at night to help them sleep. Special climate conditions are created for animals living in radical environments, such as penguins which are kept in refrigerated rooms. Special enclosures for reptiles, amphibians, insects, fish, and other aquatic life forms have also been developed.

Management and animal care

Zoo keeper with Little Penguins (Eudyptula minor) at Melbourne Zoo.

Cooperation

Related and similar institutions in aims, staff and history are public aquaria. At the time when the first zoological gardens were established during the nineteenth century also public aquaria came into existence. Today, both zoos and public aquaria are integrated in the same national and international umbrella organizations. These zoo associations proclaim to force their members to achieve certain standards in animal management, veterinary care, aims, and stewardship.

The International Species Information System (ISIS), a computer-based inventory system, was established in 1973 to facilitate collection and population management for wild animals maintained in captivity. ^[61]

Staff

Most zoological gardens incorporated within international umbrella organizations are led by professionals such as zoologists or veterinarians.
Curators plan for the development, maintenance, and growth of the animal collection and animal care staff. They are responsible for the acquisition of animals and play a role in the administration of captive breeding programs. They also participate in scientific conferences, write scientific papers, or assist in exhibit design.
Veterinarians provide medical care for ill or injured animals including surgery, vaccinations and physical exams. They also develop and implement preventive health care, or help determine healthful animal diets.
Responsible for the actual care of the animals within these institutions are well trained zoo keepers. Some keepers can become highly specialized such as those who concentrate on a specific group of animals like birds, great apes, elephants or reptiles. Daily basic duties of zoo keepers include cleaning and maintenance of animal enclosures and feeding of the animals. Some keepers prepare animal diets, report and record animal's health and behaviour, or assist veterinarians. The educational requirements for an entry level zoo keeper vary but are often a college degree in zoology, biology or an animal-related field.^[62] Some colleges offer programs oriented towards a career in zoos. Job advancement is also possible but more limited than in some other careers requiring a college degree.^[63] Some zoos, particularly roadside zoos, are private-owned amateur facilities with a lack of well trained personnel.

Animal care

The physical health as well as the social and behavioral well-being of zoo animals depends on enclosure design, nutrition, husbandry, management practices, group social structure, behavioral enrichment, preventive medicine, and medical and surgical care. ^[64]

Most contemporary zoos led by professionals are aware of environmental enrichment, also called behavioral enrichment, as a part of the daily care of animals. Environmental enrichment refers to the practice of providing animals with environmental stimuli. The goal of environmental enrichment is to improve an animal's quality of life by increasing physical activity, stimulating natural behaviors, and preventing or reducing stereotypical behaviors. ^[65]

But sometimes even those zoos proclaiming high standards can fail to meet them in some way. Accidental deaths during the six months of animal stocking preceding the opening of Disney's Animal Kingdom were investigated by the United States Department of Agriculture (USDA) in 1998. ^[66] After a series of publicized animal deaths at the Smithsonian Institution?s National Zoological Park (National Zoo) in early 2003, the National Academies released an interim report in 2004 and an final report in 2005. ^[67] Another example is the captive breeding management of great apes where these animals and their infants are traded and shuttled from place to place.^[68]

Because they wanted to stress conservation issues, many large zoos stopped the practice of having animals perform tricks for visitors. The Detroit Zoo, for example, stopped its elephant show in 1969, and its chimpanzee show in 1983, acknowledging that the trainers had probably abused the animals to get them to perform.^[69]

Some practices in certain countries with low-income economies are frowned upon by many western, high-income societies. Some examples include:

• The Badaltearing Safari Park's practices (China), where zoo visitors can throw live goats into the lions' enclosure and watch them being eaten, or can purchase live chickens tied to bamboo rods to dangle into lion pens. Visitors can drive through the lion's compound on buses with specially designed chutes leading into the enclosure into which they can also push the live chickens.^[70]

• Xiongsen Bear and Tiger Mountain Village's (near Guilin in south-east China) practice in which live cows are fed to tigers to amuse visitors.^[70]

• Qingdao Zoo's practices, (near Beijing, China) where visitors engage in "tortoise baiting", in which they are encouraged to throw coins at the turtle's heads. The turtles here have elastic bands around their necks, so that they can't retract.^[70]

Acquisition and surplus of animals

Zoos acquire animals through captive breeding programs, trade among zoos or collecting from the wild. The collection, trade, and transport of wild animals is regulated by government agencies. ^[71]

Controversy surrounded the importation of seven African elephants (an officially endangered species) from the wilds of Swaziland to the San Diego Wild Animal Park in 2003, despite offers to move the elephants to reserves elsewhere in Africa. Prior to the import, three resident elephants were shipped to Chicago's Lincoln Park Zoo, where all three elephants died within two years. ^[56] There have been births from the Swaziland elephants since coming to the Wild Animal Park. In 2008, the Wild Animal Park houses eleven African elephants in a enclosure. ^[72]

Zoos participating in breeding programs are responsible for the regulation of their animal collections. Euthanasia might be considered for surplus individuals. ^[73]

The downside to breeding the animals in captivity is that thousands of them are placed on "surplus lists", and sometimes sold to circuses, animal merchants, auctions, pet owners, and game farms. The San Jose Mercury News conducted a two-year study that suggested of the 19,361 mammals who left accredited zoos in the United States between 1992 and 1998, 7,420 (38 percent) went to dealers, auctions, hunting ranches, unaccredited zoos and individuals, and game farms. Some zoos have advertised surplus animals in the Animal Finders' Guide, a newsletter in which the owners of hunting ranches post notices of sales and auctions.^[74]

Deputy director of Nuremberg Zoo, Germany, said: "If we cannot find good homes for the animals, we kill them and use them as feed."^[75]

A German Greens Party politician alleged in March 2008 that hundreds of the Berlin Zoo's 23,000 animals are missing, amid allegations that they have been slaughtered, and that some tigers and leopards were sent to China to make drugs for traditional Chinese medicine. The Director of the zoo replied by saying he believes his detractors are spreading "untruths, half-truths and lies".^[75]

Regulations

Many countries have legislation to regulate zoos that requires these institutions to be licensed and inspected. Zoo regulation is usually supported by written standards relating to species, exhibits and management. ^[76]

In the United States, any public animal exhibit must be licensed and inspected by the United States Department of Agriculture, United States Environmental Protection Agency, Drug Enforcement Agency, Occupational Safety and Health Administration, and others. Depending on the animals they exhibit, the activities of zoos are regulated by laws including the Endangered Species Act, the Animal Welfare Act, the Migratory Bird Treaty Act of 1918 and others.^[77] Additionally, zoos in North America may choose to pursue accreditation by the Association of Zoos and Aquariums (AZA). To achieve accreditation, a zoo must pass an application and inspection process and meet or exceed the AZA's standards for animal health and welfare, fundraising, zoo staffing, and involvement in global conservation efforts. Inspection is performed by three experts (typically one veterinarian, one expert in animal care, and one expert in zoo management and operations) and then reviewed by a panel of twelve experts before accreditation is awarded. This accreditation process is repeated once every five years. The AZA estimates that there are approximately 2,400 animal exhibits operating under USDA license as of February 2007; fewer than 10% are accredited.^[78]

In April 1999, the European Union introduced a directive to strengthen the conservation role of zoos, making it a statutory requirement that they participate in conservation and education, and requiring all member states to set up systems for their licensing and inspection.^[79] Zoos are regulated in the United Kingdom by the Zoo Licensing Act of 1981, which came into force in 1984. The act requires that all zoos be inspected and licensed, and that animals kept in enclosures are provided with a suitable environment in which they can express most normal behavior.^[79]

As per section 38(H) of the Wild Life (Protection) Act, 1972, no zoo shall operate without being recognised by the Central Zoo Authority (CZA), New Dehli, which regulates zoos in India.^[80]

<gallery caption="Gallery" widths="180px" heights="120px" perrow="4"> Image:Amurtiger.jpg|Siberian tiger (Panthera tigris altaica) in a landscape immersion exhibit at Zurich Zoo, Switzerland Image:Edi2.jpg|King Penguins (Aptenodytes patagonicus) at Edinburgh Zoo Image:San Diego Zoo entrance elephant.jpg|Main entrance of San Diego Zoo Image:Lahore zoo Chimpanzee.JPG|Chimpanzee (Pan troglodytes) at Lahore Zoo, Pakistan Image:View of the Zoological Gardens1835.jpg|A painting of the London Zoo in 1835. Image:Animal artists at the Jardin des Plantes.jpg|Artists at the Ménagerie du Jardin des Plantes (Painting from 1902) Image:Arnhemzoo1.jpg|Indoor exhibit at Burgers' Zoo (Netherlands) Image:Panda enclosure at Chiang Mai zoo-KayEss-2.jpeg|Giant Panda enclosure at Chiang Mai Zoo. Image:Hearst Grizzly Gulch - San Francisco Zoo.jpg|Bears (Ursus arctos) in at San Francisco Zoo Image:inia.jpg|One of the rarest species in a zoo or public aquarium is the Amazon River Dolphin (picture from Duisburg Zoo) Image:Barcelona.Zoologico.Delfin.jpg|Aquarium with a dolphin at the Barcelona Zoo. Image:Seals@melb zoo.jpg|Sea lions at the Melbourne Zoo. Image:Estátuadetigrezoológicorio.jpg|A jaguar statue in Rio de Janeiros Zoological Garden. Image:Elephantsfrontgirlriodejaneiro.jpg|The old style elephant enclosure at Rio de Janeiro Zoo (Brazil) Image:zoo-sp.jpg|Monkey islands at the São Paulo Zoo. Image:Chimpanzee in zoo AB.jpg|Chimpanzee in Warsaw Zoo / June 2006. Image:Edith, PETA.jpg|This chimpanzee was born in the Saint Louis Zoo and passed to five other facilities before landing in a Texas roadside zoo 37 years later.^[81] Image:ZigongPeople'sParkZoo2.jpg|A sick macaque in the Zigong People's Park Zoo, Sichuan, China.^[82] Image:Devi AsianElephant SanDiegoZoo 20071230 RockingBehaviour.gif|Stereotypic behavior of an Asian Elephant at San Diego Zoo </gallery>

Notes

External links

• Zoos Worldwide Zoos, aquariums, animal sanctuaries and wildlife parks
• World Association of Zoos and Aquariums
• Asian Elephants at the Zoological Gardens Zoological Gardens keeping Asian Elephants

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