A vast mangrove forest shared by Bangladesh and & India that is home to possibly five hundred Bengal Tigers is being rapidly destroyed by erosion, rising sea level and storm-surges, according to a major study by researchers at the Zoological Society of .London and others. The Sundarbans forest took the: brunt of super cyclone Sidr in 2007, but new satellite studies show that 71% of the forested coastline is retreating by as much as 200 meters a year. If erosion continues at this pace, already threatened tiger populations living in the forest will be put at & risk.The Sundarbans is known for vanishing islands out the scientist said the current retreat of the mangrove forest on the southern coastline is not normal. The causes for increasing coast line retreat,other than direct anthropogenic ones, include nereased frequency of storm—surges and other extreme natural.events’, said Pettorelli, a member of .oological Society of London. Our results indicate a pidly retreating coastline that cannot be accounted by the regular dynamics of the Sundarbans. Jegradation is happening fast, weakening this natural shield for India and Bangladesh.