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For a population to remain stable, 95 per cent of adults must survive the span of one year.
In areas such as northern Australia, hunting remains the greatest impact on the dugong population.
Some aborigines regard dugongs as part of their Aboriginality.
Mozambique has had legislation to protect dugongs sincebut this has not been effectively enforced.
The nostrils are located on top of the head and can be closed using valves.
A large number of infections and parasitic diseases affect dugongs.
A wave of immigration beginning at the end of the s resulted in dugongs being hunted for food.
Occasionally individual dugongs make long-distance travels over many days, and can travel over deep ocean waters.
Seagrasses of a lower seral are preferred, where the area has not fully vegetated.
A population of over 25, exists in the Torres Strait such as off Thursday IslandDugong sex organ, although there is significant migration between the strait and the waters of New Guinea.
This leaves furrows in the sand in their path.