a-dolphin.jpg | The Daily Star

Caption: 

A long-snouted dolphin spotted in the Karnaphuli river near Chattogram city’s Ichhanagar. Unlike fish with gills, this mammal needs to come to the surface for oxygen. Such dolphin sightings have now become rare and experts blame river pollution and increased traffic on waterbodies for this. The photo was taken recently. Photo: Prabir Das
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