The title of the "largest zoo in the UK" depends on how you measure it: by acreage or by the number of animals. By land area, ZSL Whipsnade Zoo in Bedfordshire is the largest, spanning over 600 acres. It is so vast that many visitors choose to drive their own cars through certain sections or use the internal bus service to see animals like rhinos and giraffes in massive, open paddocks. If you measure by the sheer number of animals and conservation impact, Chester Zoo in Cheshire is often cited as the "best" and most visited, housing over 20,000 animals on roughly 125 acres. Whipsnade is part of the Zoological Society of London (the same organization that runs London Zoo) and is famous for its "white lion" chalk carving on the hillside. In 2026, Whipsnade remains the go-to destination for those seeking a "safari-style" experience within a traditional zoo framework, offering massive spaces that allow for large-scale breeding programs for endangered species that require more room than a typical city-center zoo can provide.