flax, a legacy of former industry, but there are some original trees augmented by plantations, including those of the Millennium Forest project, which was established in 2002 to replant, particularly with indigenous gumwood, part of the lost Great Wood and is now managed by the Saint Helena National Trust. When the island was discovered, it was covered with unique indigenous vegetation, including a remarkable cabbage tree species. The island's hinterland must have been a dense tropical forest but the coastal areas were probably also quite green. The modern landscape is very different, with widespread bare rock in the lower areas, although inland it is green, mainly due to introduced vegetation. There are no native land mammals, but cattle, cats, dogs, donkeys, goats, mice, rabbits, rats and sheep have been introduced. The dramatic change in landscape must be attributed to these introductions. As a result, the string tree (Acalypha rubrinervis) and the Saint Helena olive (Nesiota elliptica) are now extinct, and many of the other endemic plants are threatened with extinction. Some 22 named rocks and islets are offshore: Castle Rock, Speery Island, the Needle, Lower Black Rock, Upper Black Rock (South), Bird Island (Southwest), Black Rock, Thompson's Valley Island, Peaked Island, Egg Island, Lady's Chair, Lighter Rock (West), Long Ledge (Northwest), Shore Island, George Island, Rough Rock Island, Flat Rock (East), the Buoys, Sandy Bay Island, the Chimney, White Bird Island and Frightus Rock (Southeast) – all within of the shore. The national bird of Saint Helena is the Saint Helena plover, known locally as the wirebird, on account of its wire-like legs. It appears on the coat of arms of Saint Helena and on the flag. Climate The climate of Saint Helena is tropical, marine and mild, tempered by the Benguela Current and trade winds that blow almost continuously. The climate varies noticeably across the island. Temperatures in Jamestown, on the north leeward shore, are in the range in the summer (January to April) and during the remainder of the year. The temperatures in the central areas are, on average, lower. Jamestown also has a very low annual rainfall, while falls per year on the higher ground and the south coast, where it is also noticeably cloudier. There are weather recording stations in the Longwood and Blue Hill districts. Administrative divisions Saint Helena is divided into eight districts, with the majority housing a community centre. The districts also serve