of prey such as the osprey (Pandion haliaetus) , White-bellied Sea Eagle (Haliaeetus leucogaster) and Grey-headed Fish-eagle (Ichthyophaga ichthyaetus) . The Sundarbans were designated a Ramsar site on May 21, 1992. [28] Some of the more popular birds found in this region are Open Billed Storks , White Ibis , Water Hens