#avian diversity
#Bangladesh wetland
#bird migration
#bird sanctuary
#birdwatching
#conservation site.
#eco-tourism
#global flyway
#haor basin
#migratory birds
#natural habitat
#nature in Bangladesh
#seasonal birds
#Sunamganj
#Tahirpur
#Tanguar Haor
#unique ecosystem
#water birds
#wetland biodiversity
#winter birds
Feb 4, 2012
