Irrawaddy dolphins are a precious living resource of Myanmar. Irrawaddy dolphins are found in coastal areas in South and Southeast Asia, and in three rivers: the Ayeyarwady (Myanmar), the Mahakam (Indonesian Borneo) and the Mekong. The Mekong River Irrawaddy dolphins inhabit a 118-mile stretch of the river between Cambodia and Lao PDR and are scarce—between 78 and 91 individuals are estimated to still exist. These dolphins have a bulging forehead, short beak, and 12-19 teeth on each side of both jaws. According to the previous survey (2002), over 41 individuals of Irrawaddy Dolphin have been recorded in Ayeyarwaddy (Irrawaddy) River. The best time to go for dolphins watching is from November to May but the best time for observation of co-operative fishing between throw-net fishermen and Irrawaddy Dolphins is between January and April.