Indo-Pacific Finless Porpoise

The Indo-Pacific finless porpoise is one of eight porpoise species. Adults are typically a uniform light grey, sometimes with lighter patches around the mouth or darker patches in front of the flippers. Most are over 1.55 m long and 30–45 kg, though they can grow to 2.27 m and 72 kg. Newborns of the western subspecies are a light creamy grey and darken with age. Its clicks are narrow-band, with peaks above 100 kHz (Wikipedia, general species account).

It lives in the coastal waters of Asia, especially around Indonesia, Malaysia, India and Bangladesh, and along the whole west coast of India up into the Persian Gulf. It is one of the species protected in Sundarbans National Park. It feeds opportunistically on fish, crustaceans and cephalopods, and eats some plant material when in estuaries, mangroves and rivers. The basic pod is a mother and calf or two adults, and breeding is in late spring and early summer (Wikipedia, general species account).