The world's largest zoo, in terms of numbers of different species in captivity, is the Toronto Zoo. The 287-ha (710-acre) site currently houses 16,000 animals from 491 different species, ranging from bears to penguins, and receives on average 2.6 million visitors each year.
Sources: Guiness World Records
The largest Zoo in terms of land mass is the Monarto Zoological Park in Australia with a total of 1450 hectares. The zoo main purpose is conservation of endangered and to educate the public. The Monarto Zoo participates in numerous successful breeding programs.
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The biggest zoo in the world by land area is the San Diego Zoo Safari Park in California, USA, covering over 1,800 acres. The Henry Doorly Zoo in Omaha, Nebraska, USA, is known for having one of the largest indoor rainforest exhibits in the world. These are two of the largest zoos based on different criteria.
The Thiruvananthapuram Zoo in Kerala, India, is one of the largest in the world. It covers over 55 acres of land and is home to a wide range of species.
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The San Diego Zoo and the Los Angeles Zoo are popular zoos in California. Both offer a wide variety of exhibits featuring animals from around the world.
The first public zoo in the world was established by Queen Hatshepsut in 1500 B.C. in Egypt. She had animals collected from all over Africa. The Philadelphia Zoo opened on July 1, 1874. In addition to being the first zoo in the United States, it opened the first childrens' zoo in the Western Hemisphere in 1937.
Savanna Grasslands is called the zoo of the world as the grassland is very vast. These grasslands are the grazing lands and is the home of millions and millions of extant animals and was the home of extinct animals in the past. The animals almost of all species are found in this grasslands and is bareless zoo.