Found the following article online, use it to answer the question: What is at risk in the sand dunes due to the large amount of visitors at the small village?

A 2005 survey at six North Norfolk coastal sites (Snettisham, Titchwell, Holkham, Morston Quay, Blakeney and Cley) found that 39 per cent of visitors gave birdwatching as the main purpose of their visit. The 7.7 million day visitors and 5.5 million who made overnight stays in the area in 1999 are estimated to have spent £122 million, and created the equivalent of 2,325 full-time jobs. Titchwell Marsh RSPB, Cley Marshes NWT and Holkham NNR each attract 100,000 or more visitors annually.The small village of Titchwell shows the effect that wildlife visitors can have locally. It adjoins the RSPB's busiest reserve, Titchwell Marsh, and a 2002 survey reported that an estimated 137,700 visitors spent £1.8 million in the area in 1998. The village has two three-star hotels and a shop selling telescopes and binoculars, although it does not have a general store or a public house.The large number of visitors sometimes has negative effects. Wildlife may be disturbed, a frequent difficulty for species that breed in exposed areas such as ringed plovers, little terns and common seals, but also wintering geese. Plants can be trampled, which is a particular problem in sensitive habitats such as sand dunes and vegetated shingle. Damage is reduced by measures such as wardening breeding colonies, using fences, boardwalks and signs to control access, and appropriate positioning of car parks. The Norfolk Coast Partnership, a grouping of conservation and environmental bodies, divide the coast into zones for tourism development purposes. Holme dunes, Holkham dunes and Blakeney Point, sensitive habitats suffering from visitor pressure, were designated as red-zone areas with no development or parking improvements to be recommended. "Orange" locations had fragile habitats, but were under less tourism pressure, or, as with the large nature reserves, were equipped to cope with many visitors. The most robust sites, mainly outside the SSSI, were placed in the green zone.

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