Look around you, for this is no ordinary place. About a tenth of all the world's lowland heaths are found in southern England, and Headley includes the largest remaining area of acid heathland on the North Downs. Although heathland is an artificial habitat, it's home to many rare and threatened species. Go quietly, and you may see stonechats, woodlarks and even the occasional Dartford warbler. Common lizards live here too, as well as slow worms. These plain, silvery little legless lizards are often mistaken for snakes, though in fact they're completely harmless.