The Chital deer are widely seen in southwestern woodlands. Other animals include the black giant squirrel, capped langur, Bengal fox, sambar deer, jungle cat, king cobra, wild boar, mongooses, pangolins, pythons and water monitors. Bangladesh has one of the largest populations of Irrawaddy dolphins and Ganges dolphins. A 2009 census found 6,000 Irrawaddy dolphins inhabiting the littoral rivers of Bangladesh. The country has numerous species of amphibians (53), reptiles (139), marine reptiles (19) and marine mammals (5). It also has 628 species of birds.