Dugong
The Dugong, Dugong dugon, is one of only four extant sirenian mammals. They are unique amongst marine mammals by being almost entirely herbivorous. The Dugongs main food is seagrass, and to a much lesser extent marine algae when seagrass is scarce. Individuals are known to occasionally take marine invertebrates such as mussels and tunicates. The species is long-lived (up to 70 years), relatively slow to attain sexual maturity (greater than nine years), and the interval between the birth of calves ranges from three to seven years. The Dugong has a broad but disjunct distribution in tropical and subtropical shallow coastal waters of the Indian and Western Pacific Oceans The Dugong does not breed in NSW (New South Wales), however habitat and resources within the state remain important to visiting individuals. Prior to 1992, only 14 Dugong records were known for NSW. A further 50 individuals, many of them dead, were recorded in NSW between 1992 and 1993. This influx of Dugongs to NSW waters coincided with a catastrophic loss of 1000km2 of seagrass from Hervey Bay (Queensland) after severe floods. NSW waters act as a refuge area for Queensland's Dugongs.


Extracted from : http://www.environment.nsw.gov.au/determinations/DugongEndSpListing.htm