corals and fishes. The marine site has been part of long term research and study on coral reefs and global climate change. The island is also home to the Samoa Flying-fox (Pteropus samoensis), a species of bat threatened by habitat loss. Olosega Olosega is the smallest island in the Manuʻa Islands. It is possible to walk across to Ofu Island at low tide. The name derives from Samoan ʻOlosega, "fortress of parakeets." Olosega Island is a remnant of the Sili shield volcano, the caldera of which may lie submerged off the north shore. The volcanic eruption of 1866 was actually east of Olosega, on a mid-ocean ridge that extends east southeast to nearby Taʻū. The island forms the Olosega County subdivision of the Manuʻa District. It has a land area of 5.163 km² (1.993 sq mi), and had an official population of 172 persons as of the 2010 census. There are four villages on Olosega: Olosega, Lalomoana, Sili, and Faiava. Gallery References External links Office of the Governor. 2004. Manu‘a ma Amerika. A brief historical documentary. Manu‘a Centennial. 16 July 1904. 16 July 2004. Office of the Governor, American Samoa Government. 20 p. National Park Service map of the Manu‘a Islands Persistence of Coral Reefs Under Extreme Environmental Stress in American Samoa G. Piniak, C. Birkeland, and G. Garrison (2004). University of Hawaii. Islands of American Samoa Mountains of American Samoa Volcanoes of American Samoa Polygenetic shield volcanoes Manu'a