the east. Due to its distinctive flora and fauna Sumba has been categorised by the World Wildlife Fund as the Sumba deciduous forests ecoregion. Although generally thought to be originally part of the Gondwana southern hemisphere supercontinent, recent research suggests that it might have detached from the South East Asia margin. Sumba is in the Wallacea region, having a mixture of plants and animals of Asian and Australasian origin. Most of the island was originally covered in deciduous monsoon forest while the south-facing slopes, which remain moist during the dry season, were evergreen rainforest. Fauna There are a number of mammals, but the island is particularly rich in bird-life with nearly 200 birds, of which seven endemic species and a number of others are found only here and on some nearby islands. The endemic birds include the endangered Sumba eclectus parrot, four vulnerable species — the secretive Sumba boobook owl, Sumba buttonquail, red-naped fruit-dove, and Sumba hornbill — as well as three more common species: the Sumba green pigeon, Sumba flycatcher, and apricot-breasted sunbird. Saltwater crocodiles can still be found in some areas. The Sumba hornbill or Julang Sumba (Rhyticeros everetti) is under increasing threat of extinction. Indiscriminate deforestation is threatening their survival. The population is estimated at less than 4,000 with an average density of six individuals per square kilometre. A hornbill can fly to and from over an area of up to 100 square kilometres. Threats and preservation Most of the original forest has been cleared for the planting of maize, cassava, and other crops so only small isolated patches remain. Furthermore, this clearance is ongoing due to the growing population of the island and this represents a threat to the birds. In 1998 two national parks were designated on the island for the protection of endangered species: the Laiwangi Wanggameti National Park and Manupeu Tanah Daru National Park. Administration Sumba is part of the East Nusa Tenggara province. The island and the very small 0ffshore islands administered with it are split into four regencies (local government regions), following re-organisation on 2 January 2007 when two new regencies were created from parts of West Sumba Regency. The four regencies are Sumba Barat (West Sumba), Sumba Barat Daya (Southwest Sumba), Sumba Tengah (Central Sumba) and Sumba Timur (East Sumba). The island had 686,113 inhabitants at the 2010 Census, which accounted for 14.6% of the provincial population in 2020. The