||Primates: Hylobates klossii (Bilou or Dwarf Siamang), Presbytis potenziani (Joja or Lutung Mentawai), Simias concolor (simakobu), Macaca pagensis (Bokkoi or Beruk Mentawai) …
Mammals: There are about 28 species of mammals, 65% of which are endemic to genera, species and subspecies. Among the 28 species of mammals, the primate group became the main concern because the four species of primates in Mentawai are endemic. There are 7 species of squirrel, 5 species of which are endemic: Callosciurus melanogster, Sundasciurus fraterculus, Lariscus obscurus, Iomys sipora and Hylopetes sipora … Three species of rats in Siberut are endemic subspecies of the Mentawai islands Rattus tiamonicus mentawi (commonly found at home house and forest edge), Rattus surifer pagensis (live in primary forest, colorful body and around brown neck, black back, white belly and both sides of tungging and thighs of old yellow), Hundred sabanus siporanus (found in the forest black primers on the top and bottom white).
Siberut has only three carnivores, two species of civet are endemic at the subspecies level and one species of beaver (Aonyx cinerea). Weeds that live in Siberut are very different from civets commonly found in Sumatra. None of these traits are encountered in civets living in Siberut so-called primitive weasels. The two species of civets are: Paradoxurus hermaproditus siberu and Hemigalus derbyanus sipora.
The largest mammals that live in Siberut are Sambar (Cervus unicolor oceanus). These animals are often hunted if around the village or hunted by using a mesh in the forest.
Marine mammals in the waters of Siberut Island consist of whales, spotted dolphins (Stenella longirostris, Delphinus sp and Grampus sp) are often seen around the eastern coast of Siberut and dugongs (Dugong-dugon) which are very rare in waters East Coast.
Birds: In Siberut Island there are many bird species of 106 birds, 13 species (12%) of which are endemic to subspecies. The only species of endemic bird on the island is the Mentawai Celepuk (Otus Mentawai). The inventory of Siberut National Park (2000) has 134 species of birds in Siberut.
The birds occupy the profile stratification of the forest, where the main canopy (> 25 m) inhabitants are hornbills, hawks, crows, parrots, etc. Inhabitants of the middle canopy (10-25 m) inhabited with birds of punai, kutilang, srigunting etc. In the lower canopy (4-10 m) inhabited by birds of honey, magpie, lathe etc. Most traded birds are parrots (Gracula religiosa batuensis) and stone magpie.
Reptiles-Amphibious-Fish: According to the writings of A. Whitten, J. Dring and Mitchell (1982), there are 21 amphibian species on Siberut Island and one of them is the endemic type frog that is Rana signata siberut. While from reptilia there are 62 species and 3 of them are endemic snake species that is Calamaria klossii and Oligodon sp. of the Colubrinae tribe as well as the Boiga nigriceps brevicauda of the Boiginae tribe.
The reptile species are Gekkonidae / gecko 6 species, Varadinae / lizard 1 species, Scincidae / Lizard 7 species, Columbrinae / Snake 11 species, Boidae / species 2 species, Xenopeltidae / snake 1 species, Natricinae / 2 species water snake, Agamidae / lizard 8 species, Boiginae / Snake 7 species, Elapidae / Serpent Viper 2 species, Viperidae / Serpent Viper 5 species, 2 species of turtle, 2 species Cheloniidae / turtle, Dermochelyidae / leatherback 1 species, Crocodylidae / crocodile 1 species, Homalopsinae / snake 1 species, Sibynophinae / snake 1 species and Pareinae / snake 2 species.
Insects: Based on the inventory of insects by Siberut National Park Office in 1999, identified 45 families belonging to 11 orders. So in Siberut there are 29.4% of the order and 5.9% of the family of insects found in the world. The Ordinary Order consists of 5 tribes, Orthopterid consists of 4 tribes, Dermaptera consists of 1 tribe, Hymenoptera consists of 5 tribes, Coleoptera consists of 11 tribes, Hemiptera consists of 4 tribes, Lepidoptera consists 9 tribes, Phasmida consists of 1 tribe, Odonata consists of 4 tribes and Isoptera consists of 1 tribe.
Results of the inventory of Siberut National Park Hall in 1999, found 12 butterfly families consisting of 45 genera with 60 species of butterflies. Of these types there are 1 species that are endemic to the Mentawai Islands is Chyntia sipora from family Nymphalidae. Currently butterflies have no economic value but in the era of 80 many foreigners who buy butterflies in the community, especially Japanese people.
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