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Flora and fauna

Timor and its offshore islands such as Atauro, a former place of exile increasingly known for its beaches and coral, as well as Jaco along with Wetar and the other Barat Daya Islands to the northeast constitute the Timor and Wetar deciduous forests ecoregion. The natural vegetation was tropical dry broadleaf forests with an undergrowth of shrubs and grasses supporting a rich wildlife. However much of the original forest has been cleared for farming, especially on the coasts of Timor and on the smaller islands like Atauro. Apart from one large block in the centre of Timor only patches remain. This ecoregion is part of the Wallacea area with a mixture of plants and animals of Asian and Australasian origin; it lies in the western part of Wallacea, in which Asian species predominate.

Many trees are deciduous or partly deciduous, dropping their leaves during the dry season, there are also evergreen and thorn trees in the woodland. Typical trees of the lowland slopes include Sterculia foetida, Calophyllum teysmannii and Aleurites moluccanus.

During the Pleistocene epoch, Timor was the abode of extinct giant monitor lizards similar to the Komodo dragon. Like Flores, Sumba and Sulawesi, Timor was also once a habitat of extinct dwarf stegodonts, relatives of elephants.

Fauna of today includes a number of endemic species such as the distinctive Timor shrew and Timor rat. The northern common cuscus, a marsupial of Australasian origin occurs as well, but is thought to be introduced. The island have a great number of birds, mainly of Asian origin with some of Australasian origin. There is a total of 250 species of which twenty four are endemic, due to the relative isolation of Timor, including five threatened species; the slaty cuckoo-dove, Wetar ground dove, Timor green pigeon, Timor imperial pigeon, and iris lorikeet.

Saltwater crocodiles are found in the wetlands whereas reticulated pythons can be found in forests and grasslands of Timor. However, the population sizes and status are unknown.

Frog species in Timor include Duttaphrynus melanostictus, Hoplobatrachus tigerinus, Limnonectes timorensis, Litoria everetti, and Polypedates leucomystax. A new species of microlyhid frog belonging to the genus Kaloula has also recently been discovered in Timor.

Late Cretaceous fossils of marine vertebrates are known from East Timor deposits. These include mosasaurs such as Globidens timorensis, lamniforme sharks, coelacanths and the choristodere Champsosaurus.