A massive oil spill from a stricken tanker is threatening endangered dolphins and other rare wildlife in the world's largest mangrove forest, Bangladesh officials warned Dec. 11. Rescue vessels have now salvaged the tanker, but the slick had already spread to a second river and a network of canals in the Sundarbans, a UNESCO World Heritage Site [6], which straddles India and Bangladesh. "It's a catastrophe for the delicate ecology of the Sundarbans," the area's chief forest official Amir Hossain told the AFP news agency. "The oil spill has already blackened the shoreline, threatening trees, plankton, vast populations of small fishes and dolphins." The tanker was carrying more than 350,000 liters of oil when it collided with another vessel and sank in the Sundarbans' Shela River, home to the endangered Ganges dolphins. Forest and security officials are on high alert amid fears the spill may cross over to the Indian side of the Sunderbans, home to Bengal tigers, ridley turtles, and other rare flora and fauna. The Sunderbans is also an important feeding area for migratory birds from Siberia. (Radio Australia [7], Al Jazeera [8], Business Standard [9], India, Dec. 11)