Island Sanctuary Stock grazed on Tiritiri Matangi until the lease expired in 1972   Tiritiri Matangi is one of the few island sanctuaries that people can visit The government has owned Tiritiri Matangi from the early lighthouse days in the mid 19th century. During that time it was leased for farmers to graze stock. When the lease expired in 1972 the government decided to stop the grazing and that the island could be left to regenerate. It would be an ideal location for rare native birds and so was classified as a scientific reserve. Scientists estimated that it would take a very long time for the forest to regenerate on its own. There was only 10% of the island left in remnant forest. A plan to restore the forest was developed. Seedlings were raised and over 50% of the island was replanted in shrub and tree seedlings. In 1980 Tiritiri Matangi was made an open island sanctuary. Many island sanctuaries have restricted public access. However it was decided that people needed the opportunity to see native species so Tiritiri Matangi has free visiting access. Tiritiri Matangi is an ideal location to look after endangered species. The sea acts as a natural barrier and stops any predators introducing themselves. To keep the island pest free all visitors are asked to be extremely careful bringing food and equipment to Tiritiri Matangi. All food must be rodent proof before coming ashore and boat owners must not land dogs on the island.