The fauna of Arunachal Pradesh is equally rich with as many as 25 species of mammals included in Schedule – I of the Wildlife (Protection) Act, 1972.

The large herbivours of the foot-hills and adjoining plains are the elephant (Elephas maximus), gaur (Bos gaurus) and the wild buffalo (Bubalus bufalis).

Arunachal Pradesh is perhaps the only State which has four major cats, i.e. tiger (Panthera tigris), leopard (Panthera pardus), clouded leopard (Neofelis nebulosa) and snow leopard (Panthera uncia). Lesser cats like the golden cat, leopard cat and the marbled cat are also found here.

Seven species of primates i.e. hoolock gibbon, slow loris, Assamese macaque, rhesus macaque, pig-tailed macaque, stump-tailed macaque, and capped langur also occur in the forests of the State. This is the only state where all the 3 goat antelopes occurring in India, i.e. serow, goral and takin are found.

Arunachal Pradesh is a treasure trove of nature. It has the maximum forest cover amongst all the states of India and perhaps many parts of the world! Sixty one percent of its geographical area comprises forests. This translates to read as 51,540-sq-km. The marvel does not stop there. The forests are spread over an elevation of 100m in the foothill regions to 7,000 m in the Himalayas . Such an ecological diversity has naturally resulted in varying forest types.

The tropical forests at the foothills up to the height of 1,000 m are of the wet evergreen variety as well as the tropical evergreen variety and the riverine semi green variety. Then there are the sub tropical forests 1,000-2,000 m), the pine forests 1,000-2,000 m) and the temperate forests 2,000-3,000m). There are both the broad-leafed temperate forests as well as the conifer forests. The bamboo forests and grasslands have not been enlisted so far.

Namdapha National Park - The Indian Rain Forest Region

Within one single forest, animals from four types of climatic zones can be found because the forest stretches across the four of them! The forest that covers four climatic zones is called Namdapha. Namdapha National Park, one of the surviving rain forests of the world, is located on the banks of the river Noa Dihing, which later becomes the Brahmaputra.

The park with dense vegetation is largely inaccessible and houses diverse flora and fauna that are typical of this area. An eerie silence is pierced by the screeches of preys and predators. The Majestic Gaur or Mithun, Elephant, Himalayan Black Bear, Takin, the Wild Goat peculiar to the Patkoi Range, Musk Deer, Slow Loris, Binturong and the Red Panda are all found here.

Mouling National Park

is famous for varieties of goat, namely, antelopes, goral and serrow Thingbu and Tsachu hot water springs - are sulphur rich which serves as antidote to many skin ailments.

Sessa Orchid Sanctuary and Orchid Research Center - is located in Tippi, where exquisite specimens of orchids, natural , hybrid as well as endangered, can be found. These are at their best during spring and monsoon season.