Sundarbans East Wildlife Sanctuary but their chief prey is the spotted deer ("Axis axis") and the wild boar ("Sus scrofa"). There are three species of wild cat, the leopard cat ("Prionailurus bengalensis"), the fishing cat ("Prionailurus viverrinus") and the jungle cat ("Felis chaus"). Also present are three species of otter, one of which, the smooth-coated otter ("Lutrogale perspicillata"), has been domesticated by local fishermen. The South Asian river dolphin ("Platanista gangetica") inhabits some of the larger water channels. Birds are plentiful with over 270 having been recorded in the area including 38 species of raptor, 95 species of waterfowl and 9 of kingfisher. On
Pollution of the Ganges few species of fresh water dolphins in the world. Listed as an endangered species, their population is believed to be less than 2000. Hydroelectric and irrigation dams along the Ganges that prevents the dolphins from travelling up and down river is the main reason for their reducing population. The Ganges softshell turtle ("Nilssonia gangetica") is found in the Ganges, Indus, and Mahanadi river systems of Pakistan, northern India, Bangladesh, and southern Nepal. This turtle inhabits deep rivers, streams, large canals, lakes and ponds, with a bed of mud or sand. According to the International Union for Conservation of Nature, freshwater