The Government of Bangladesh recently declared three new wildlife sanctuaries for endangered freshwater dolphins in the world’s largest mangrove ecosystem – the Sundarbans, according to the Wildlife Conservation Society (WCS) whose conservation work helped pinpoint the locations of the protected areas.

The sanctuaries, which were officially declared on January 29, will protect the last two remaining species of freshwater dolphins in Asia: the Ganges River dolphin and the Irrawaddy dolphin. Although there is no global population estimate for either species, both have disappeared from major portions of their range. However, both species occur in the Sundarbans in sufficient numbers, which may serve as a global safety net for preventing their extinction