1 
2 The zoo is well located in Omaha, Nebraska. Developed in 1864, the zoo now covers the total land area of 130 acres and is home to 962 species. It has the largest number of cat species in North America.
3 
4 
5 Located in Ohio, the Columbus Zoo and Aquarium is the No. 1 Non-Profit Zoo in the US. Currently, it houses 793 species and is sprawled over 580 acres. It holds over 9000 animals and greets around 2.2 million visitors every year.
6 It is the oldest scientific zoo in the world which was founded in 1828 for scientific researches. In 1847, it was opened to public. Today, it has 755 species and is sprawled over 36 acres. It has around 16000 animals.
7 Stretched on over 210 acres in Pretoria, the national zoo is divided into two major areas – one covers the hilly regions and one lies on the plains, split by Apies river. It houses total 705 species and 9000 animals.
8 Established in 1974, the Toronto Zoo is Canada’s Largest Zoo as it is stretched on over 710 acres and has 491 species. The Metropolitan Toronto Zoo holds around 5000 animals.
