Endemic Birds of Assam Assam Plains is one of the 12 Endemic Bird Areas (EBA) in India, which supports more than a dozen of restricted-range bird species. Beautiful Sibia. Image ©Kshounish Sankar Ray. By Mithu Das November 27, 2011 It is a phenomenon well known to biologist that certain areas of the world, particularly in tropical regions, support concentrations of animal and plant species with restricted ranges, i.e. species that are found nowhere else in the earth. The Endemic Bird Areas of the World Birds found in certain natural areas and could not be seen anywhere else may called restricted-range birds. According to Stattersfield and their collea...