http://www.bbc.co.uk/news/world-south-asia-15517214
The dolphins are among the world's most endangered mammals (Photo: Rubaiyat Mansur Mowgli)
Bangladesh is declaring three areas in the southern Sundarbans mangrove forest as dolphin sanctuaries to protect freshwater dolphins, officials say.
Conservationists say the mangrove forest is the only place in the world where the Ganges river dolphins and Irrawaddy dolphins are found.
These dolphins are among the world's most endangered mammals.
Fishermen normally do not target them, but the animals get entangled in fishing nets and drown.