These enormous vegetarians can be found in warm coastal waters from East Africa to Australia, including the Red Sea, Indian Ocean, and Pacific. Dugongs are related to manatees and are similar in appearance and behavior— though the dugong's tail is fluked like a whale's. Both are related to the elephant, although the giant land animal is not at all similar in appearance or behavior. Dugongs graze on underwater grasses day and night, rooting for them with their bristled, sensitive snouts and chomping them with their rough lips. These mammals can stay underwater for six minutes before surfacing. They sometimes breathe by "standing" on their tail with their heads above water. Dugongs spend much of their time alone or in pairs, though they are sometimes seen gathered in large herds of a hundred animals. Female dugongs have one calf after a yearlong pregnancy, and the mother helps her young reach the surface and take its first breath. A young dugong remains close to its mother for about 18 months, sometimes catching a ride on her broad back. These languid animals make an easy target for coastal hunters, and they were long sought for their meat, oil, skin, bones, and teeth. Dugongs are now legally protected throughout their range, but their populations are still in a tenuous state. Some believe that dugongs were the inspiration for ancient seafaring tales of mermaids andsirens.NATIONA GEOGRAFICS.................................................................................Dugong The dugong is a large marine mammal found in the warm waters surrounding Indonesia and Australia. Although the dugong can be found widely throughout the Indo-Pacific tropics, the highest population of the dugong is concentrated around northern Australia. Although the dugong looks extremely similar to a manatee, the two are different species. The dugong and the manatee are very closely related and can look almost identical until you look at their tail. The tail of the dugong is typically forked like the tail of a shark, where the tail of the manatee is broad and flat, and slightly more flipper looking than fin looking. Dugongs are smaller than manatees with the average adult dugong reaching lengths of around 3 meters and weigh nearly 400 kg, which is about the same as a large cow. The front flippers of the dugong can be as much as half a meter in length. It is thought the legends of mermaids may have originated when sailors from a distance glimpsed dugongs swimming in the water, and mistook them for half-human half-fish creatures. These mermaid legends are also said to be true of the dugongs larger cousin, the manatee. Dugongs inhabit the warm shallow waters, and despite their large size, dugongs are strictly herbivorous animals and have been referred to as the cows of the sea. Dugongs graze on sea grasses and aquatic plants that grow in abundance in the tropical shallows. Dugongs eat large amounts of sea plants and often leave feeding trails behind of bare sand and uprooted sea grass. Female dugongs give birth to just one calf about once every five years. The baby dugong is born underwater in the warm shallows, where the baby dugong is immediately able to swim to the surface in order to take its first breath. When the baby dugong is born, the dugong calf is about a meter in length and weighs about 20 kg. The dugong calf will stay close to its mother until the baby dugong is about 2 years old. Dugong populations are constantly decreasing, with many dugongs being accidental victims in large commercial fishing. Dugongs are now considered to be vulnerable animals but the dugong will commonly get older than 70 years of age. Dugong calves will not reach their full size until they are about 15 years old.