Cetacean is one of the most distinctive and highly specialized orders of mammals meant whale, dolphins, and porpoises. They include the largest animal that has ever lived, the blue whale; the highly intelligent and communicative dolphins; the tusked narwhals and blind river dolphins and singing humpback whale, nearly eighty living species in all. Most species are marine but some dolphin species are found in both marine and freshwater such as Irrawaddy dolphin (Organelle brevirostris) which is distributed in near shore tropical & subtropical marine waters, often associated with estuaries and mangrove forest. They also occur far upstream in the Ayeyarwady (formally Irrawaddy) river system of Myanmar, Makhakam river of Indonesia, and Mekong river system of Loa, Cambodia, and Vietnam. Information on composition of abundant of cetacean species in the Southeast Asian waters are still not sufficient. Most of cetacean research has been conducted based on the field observation, and dead specimens recording at shore.
0 Comments