Dhaka, Shawwal 11, 1436, Jul 27, 2015, SPA -- The number of big cats in the world's largest mangrove forest appeared to decrease drastically as only about 100 Bengal tigers were found in the Sundarbans of Bangladesh, dpa quoted a new survey as saying Monday. Experts who carried out the World Bank-funded study said poaching and pollution played roles in the reduction of Bengal tiger population in Bangladesh. "The current assessment covers a reasonably large area of the Sundarbans by camera traps," the report said. "Tiger population in Bangladesh was estimated to be between 83 to 130, with a midpoint of 106 tigers." "This is the first ever effort to quantify tiger abundance in Bangladesh Sundarbans based on a robust scientific protocol using camera traps and double sampling approach," the report mentioned. A government census in 2004 tracking footprints had estimated the number of tigers at 440 in the Bangladeshi part of the Sundarbans. -- SPA 18:54 LOCAL TIME 15:54 GMT www.spa.gov.sa/w