 In December 2006 work started on building a 9 km long specialised pest-exclusion fence, to enclose 307 ha of regenerating forest.The 1.9m high fence is designed to keep out all introduced mammals such as cats, possums, rats, stoats, ferrets and even mice.It uses stainless steel mesh that continues down to form a skirt at ground level that prevents animals from burrowing under it.