If you are cruising down the untamable Brahmaputra, you might catch a glimpse of a fin, or an elongated nose of a marine mammal breaking the surface. This is nothing but the rarest Gangetic River Dolphin called Xihu in Assamese.
This dolphin grows to a maximum length of 8ft, weighs over 100 kg and has 28 sharp, curved teeth on both its upper and lower jaw. Since this dolphin breathes through its nose and cannot breathe inside the water, it has to surface once every 30-50 seconds, increasing your chances of spotting them instantly. The Gangetic River Dolphin is among the four freshwater dolphins found in the world. Its uniqueness lies in its highly developed sonar sense, owing to which it captures its prey and navigates with the help of echolocation.