Top 8 Biggest Zoo In The World In 2023   1.Columbus Zoo and Aquarium The Columbus Zoo and Aquarium is a non-profit zoo located north of Columbus, Ohio. The Columbus Zoo has more than 5,000 animals representing more than 700 species in various geographic regions of the world. In 2004, the zoo began expanding the 82-acre (37-hectare) zoo over the next 10 years. 120-acre expansion plans include polar environments and African savannah.  :arrow: The Best Airlines In The World 2.Moscow Zoo Open to visitors since 1864, Moscow Zoo is one of the oldest zoos in Europe. Today, the Moscow Zoo is the largest zoo in Russia with more than 6,000 animals representing 927 species and covering an area of about 53 acres (21.5 hectares). Top 8 Biggest