Some zoos continue to provide their animals inadequate care, particularly those zoos that are unlicensed, those that are overly commercially-concerned, and those that suffer from lack of money.
Some animals that bear the name "crab" are not true crabs.
The success of London Zoo set off a wave of similar establishments.
The term zoological garden refers to the biological discipline zoology, which derives from Greek ??? ("animal") and ????? ("study").
Zoos may also require special licenses to meet the requirements of their particular locality.
Unfortunately, historically there also have been unethical zoo operators, more concerned with exploiting this human nature for profit than in providing satisfactory conditions for the animals exhibited.
Beyond recreation, other functions of zoos include research, education, and conservation (such as breeding endangered animals and sometimes reintroducing them into the wild).
A zoological garden, zoological park, or zoo is a facility in which living animals are confined within enclosures and usually displayed to the public.
Another zoo comparable to these wild animal parks is the Werribee Open Range Zoo in Melbourne, Australia, focusing on displaying animals living in a wide open savanna.
People for the Ethical Treatment of Animals (PETA) rejects the claim that the purpose of most zoos is to undertake research, to aid in conservation, or to educate.
The first zoological garden established in Australia was Melbourne Zoo in 1860.
An early formulation of a zoo was the menagerie, which has a long history from the Middle Ages to modern times.
The term was first used in 1828 for the London Zoological Gardens, soon abbreviated to "zoo."
Zoos provide these basic functions (recreation, research, education, and conservation), and indeed, often allow humans access to animals that would be difficult to see in the wild.
An animal theme park is a combination of an amusement park and a zoo, mainly for entertaining and commercial purposes.
Most fundamental are those activists that philosophically disapprove of zoos because they interpret zoos as human domination over equal creatures.
To ensure the animals' health, the food is supplied by the zoo, either from vending machines or a kiosk nearby.
Some zoos concentrate on animals of geographical regions, on animals of aquatic ecosystems, or attempt to exhibit their animals in a different ways, such as safari parks or open-range.
The first public aquarium was opened in London Zoo in 1853.
The oldest existing zoo is Vienna's Tiergarten Schцnbrunn (Vienna Zoo) in Austria, which was inaugurated in 1752 as an aristocratic menagerie founded by the Habsburg monarchy.
To achieve accreditation, a Zoo must pass a rigorous 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.
Modern day zoos may be publicly or privately owned, with ownership including municipalities, zoological societies and other charitable or non-profit organizations, for-profit corporations, and individuals.
Wild animal parks are larger than the classical zoo.
A petting zoo (also called children's farms or children's zoos) features a combination of domestic animals and some wild species that are docile enough to touch and feed.
The London Zoo was the first to be called a "zoological garden" and later "zoological gardens," after additional land was acquired (Reichenbach 2002).
Today, many zoos in Europe and North America keep animals in enclosures that attempt to replicate their natural habitats, for the benefit of both resident animals and visitors.
One of only two American state supported zoo parks is the 535-acre North Carolina Zoo located in Asheboro, North Carolina.
The Philadelphia Zoo, sometimes referred to as America's first Zoo, opened in 1874 with research considered its legitimate objective (Kawata 2002).
PETA writes that zoos usually favor exotic or popular animals over threatened or endangered local wildlife, in order to draw crowds (PETA 2007).
Some zoos have walk-through exhibits where visitors enter enclosures of non-aggressive species, such as lemurs, marmosets, birds, lizards, turtles, and so forth.
Many zoos see their primary purpose as breeding endangered species in captivity and reintroducing them into the wild. Modern zoos also aim to help teach visitors the importance on animal conservation, often through letting visitors witness the animals firsthand.
This list therefore considers both these features to determine which is the largest zoo in the world.Columbus Zoo and Aquarium.Moscow Zoo.San Diego Zoo.Toronto Zoo.Bronx Zoo.Beijing Zoo.Berlin Zoological Garden.Henry Doorly Zoo.