Sundarbans
Endangered and extinct species

Forest inventories reveal a decline in standing volume of the two main commercial mangrove species – sundari (Heritiera spp.) and gewa (Excoecaria agallocha) — by 40% and 45% respectively between 1959 and 1983. Despite a total ban on all killing or capture of wildlife other than fish and some invertebrates, it appears that there is a consistent pattern of depleted biodiversity or loss of species (notably at least six mammals and one important reptile) in the 20th century, and that the "ecological quality of the original mangrove forest is declining".

The endangered species that live within the Sundarbans and extinct species that used to be include the Bengal tiger, estuarine crocodile, northern river terrapin (Batagur baska), olive ridley sea turtle, Gangetic dolphin, ground turtles, hawksbill sea turtles and king crabs (horse shoe). The Sundarbans hold globally important numbers of the critically endangered masked finfoot and are important wintering sites for the spoon-billed sandpiper and the Indian skimmer. Some species such as hog deer (Axis porcinus), water buffalos (Bubalus bubalis), barasingha or swamp deer (Cervus duvauceli), Javan rhinoceros (Rhinoceros sondaicus), Indian rhinoceros (Rhinoceros unicornis) and the mugger crocodile (Crocodylus palustris) started to become extinct in the Sundarbans towards the middle of the 20th century, because of extensive poaching and hunting by the British and locals. There are other threatened mammal species, such as the capped langur (Semnopithecus pileatus), smooth-coated otter (Lutrogale perspicillata), Asian small-clawed otter (Aonyx cinerea) and large Indian civet (Viverra zibetha).
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