They breathe air through nostrils into their lungs, and can stay underwater for about 6 minutes. Dugongs have a life span of about 50 years in the wild.
Some dugongs live alone, others live in small herds.
These sirenians are closely related to manatees . They have a streamlined body and a flat, two-pointed tail. They rest during the day and spend most of the night eating. Dugongs have one pair of tusk-like teeth.