Protected areas of West Bengal cover 4% of the state area. Forests make up 14% of the geographical area of West Bengal, which is lower than the national average of 33%. West Bengal has a wide variety of fauna, including Bengal tigers, Indian leopards, sloth and Himalayan black bears, chital and sambar (deer), Indian boars, pygmy hogs, Indian elephants, Indian peafowl, great Indian hornbills, Eurasian spoonbills, brahminy ducks, king and Indian cobras, white-lipped pit viper, Indian and reticulated pythons, mugger crocodiles, saltwater crocodiles, gharials, and many more. A huge montane forest, Dooars, is situated in the Northern West Bengal districts of Alipur Duar, Darjeeling, and Kalimpong.Part of the world's largest mangrove forest, Sundarbans, is located in southern West Bengal.There a