People in Hathajari area on Saturday spotted body of a rare species of dolphin on a branch of Halda River in Chittagong district.
The locals said the weight of the six-feet Dolphin would be approximately 70 kilograms.
With this, at least three Dolphins were found dead for some unknown reasons on the bank of rivers in the district in last 18 days.
"The dolphin belongs to a very rare species, only 1100 to 1200 dolphins of such kind exist in the whole world, among them in Halda River we have got about 200 to 250 of them," said Md Manzoorul Kibria, who teaches Biological Science in Chittagong University, to UNB.
About the dolphin deaths, he noted, "May be the dolphins are dying due to rubber DAM of Bhujpur and random injuries from the propellers of sand lifting dredgers while the dropping of water level in the winter season might also have caused the deaths of the poor animals."
