* Sharks: Large sharks, such as tiger sharks and bull sharks, are the most common predators of adult dugongs.
* Crocodiles: Saltwater crocodiles can pose a threat to dugongs, especially juveniles.
* Orcas (Killer Whales): Orcas have been observed attacking dugongs, but this is relatively rare.
* Humans: Humans are a significant threat to dugongs due to habitat destruction, fishing bycatch, and hunting.
It's important to note that dugongs are primarily herbivores and spend most of their time grazing on seagrass. Their large size and powerful tails provide some protection from predators, and they also have thick skin that makes them difficult to bite. However, they are still vulnerable to attacks from larger predators, especially when they are young or sick.
Other factors:
* Disease: Dugongs are susceptible to various diseases, which can weaken them and make them more vulnerable to predators.
* Climate change: Climate change can negatively impact dugongs by altering their seagrass habitats and making them more vulnerable to disease.
Overall, dugongs have a relatively low number of natural predators, but they are still facing numerous threats, many of which are caused by human activities.