The Bengal tiger ( Panthera tigris ) is a kind of tiger . The Bengal tiger , or Royal Bengal tiger ( Panthera tigris tigris ) , is a tiger subspecies native to India , Bangladesh , Nepal and Bhutan , and has been classified as endangered by IUCN as the population is estimated at fewer than 2,500 individuals with a decreasing trend . None of the Tiger Conservation Landscapes within the Bengal 's tiger range is large enough to support an effective population size of 250 .