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.
Some birds are Indian peacock, kalij pheasant, blood pheasant, yellow-footed green pigeon, chestnut-breasted partridge, scarlet minivet, satyr tragopan, fire-tailed myzornis, rufous-throated partridge, Darjeeling woodpecker, Bay woodpecker, Bengal florican, red junglefowl, dark-throated thrush, rufous-gorgeted flycatcher, white-gorgeted flycatcher, white-browed bush robin, white-tailed robin, yellow-browed tit, striated bulbul, chestnut-headed tesia, chestnut-crowned warbler, black-faced warbler, black-faced laughingthrush, chestnut-crowned laughingthrush, streak-breasted scimitar babbler, scaly-breasted cupwing, pygmy cupwing, rufous-fronted babbler, black-headed shrike babbler, white-browed shrike-babbler, rusty-fronted barwing, rufous-winged fulvetta, brown parrotbill, fire-breasted flowerpecker, fire-tailed sunbird, maroon-backed accentor, dark-breasted rosefinch, red-headed bullfinch, gold-naped finch, golden-throated barbet, Hodgson's hawk cuckoo, lesser cuckoo, brown wood owl, ashy wood pigeon, mountain imperial pigeon, Jerdon's baza, rose-ringed parakeet, Rufous-necked hornbill, Oriental pied hornbill, Finn's weaver (Finn's baya), sunbird, spangled drongo, Indian paradise flycatcher (Himalayan subspecies), and great Indian hornbill.
Reptiles include the Bengal monitor, Indian Python, Indian cobra, king cobra, white-lipped pit viper, common krait, brahminy blind snake, common vine snake, and reticulated python.
In lakes, Eurasian spoonbill, brahminy duck, Northern pintail, swan goose, storks, such as painted stork, Asian openbill, lesser adjutant, and black stork, black-crowned night heron, black-necked crane, common merganser, Eurasian teal, Indian cormorant, Red-naped ibis, common kingfisher, white-throated kingfisher, and predatory birds like Indian vulture, griffon vulture, white-backed vulture, crested eagle, black eagle, mountain hawk eagle, Pallas's fish eagle, and shikra have been discovered.
The Buxa Tiger Reserve is famous for butterflies, like Indian cabbage white, bamboo treebrown, and five-bar swordtail, while Jore Pokhri Wildlife Sanctuary is the last refuge for Himalayan salamander (or newt).
The East Kolkata Wetlands in Kolkata is home to the small Indian mongoose, Asian palm civet, small Indian civet, lesser whistling duck, purple heron, grey heron, great egret, little egret, and many more waterfowl and waders.
The Sajnekhali Wildlife Sanctuary is home to smooth-coated otter, Asian water monitor, and many birds like little heron and green imperial pigeon [1].
In the rural areas like Midnapore, the smooth-coated otter, Indian crested porcupine, and white-breasted waterhen are common.
Beautiful and exotic birds inhabit Chintamoni Kar Bird Sanctuary, such as brown fish owl, bronzed drongo, Asian green bee-eater, stork-billed kingfisher, common emerald dove, and white-throated fantail, as well as butterflies like peacock pansy, striped tiger, common emigrant, and tarucus.
The oxbow lake of Purbasthali has a bird sanctuary containing various types of waterbirds, including red-crested pochard, white-browed wagtail, bronze-winged jacana, grey-headed swamphen, common coot, and osprey.
Source:[7] From a phytogeographic viewpoint, the southern part of West Bengal can be divided into two regions: the Gangetic plain and the littoral mangrove forests of the Sundarbans.