The Zoological Society of London (ZSL) is a charity devoted to the worldwide conservation of animals and their habitats. It was founded in 1826. Since 1828, it has maintained London Zoo, and since 1931 Whipsnade Zoo. One of London's most popular attractions and the world's oldest scientific zoos, the ZSL London Zoo houses 698 species of animals, with 20,166 individuals, making it one of the largest collections in the United Kingdom. Explore a world of wildlife like never before at Whipsnade Zoo, the largest zoo in the UK. Enjoy a full day of adventure making incredible memories. Recommended visiting time for the London Zoo is around two to three hours, depending on how many animals or exhibits you hope to see.