20 Popular zoo in the world Zoo protect endangered species  and help in breeding programs also teach people about animals, their habitats, and importance in nature, zoos study animal behavior, health, and breeding to help wildlife survival. Here are  20 Popular Zoos in the World San Diego Zoo, USA San diego zoo  is one of the  most famous zoos  known for  giant pandas, koalas, polar bears, elephants  and conservation programs. Singapore Zoo , Singapore Singapore zoo  is famous for  orangutans, white tigers, proboscis monkeys, giraffes  and  night safari. London Zoo, Regent’s Park UK London  zoo is  world’s oldest scientific zoo,  with historic architecture,  wildanimals like gorillas, lions, tigers, Komodo dragons. Bronx Zoo, US A Bronx zoo  is  largest metropolitan zoo  in the U.S with over 6,000 animals, famous for  snow leopards, bison, sea lions, gorillas. Beijing Zoo, China Beijing...