ZSL Whipsnade Zoo is the UK's biggest zoo. Set in 600 acres of beautiful parkland on the Chiltern Hills, the zoo is home to more than 2,500 animals, many of which are endangered in the wild. Go Wild at ZSL Whipsnade Zoo, where it's non-stop animal-watching fun at with the gigantic elephants being led around the zoo; the chunky rhinos in their sprawling paddock; cheetahs in their lair and giraffes in the suitably high-roofed enclosures.