When divers and snorkelers dream about iconic marine encounters, dugongs often top the list. These shy, seagrass-grazing mammals, sometimes called “sea cows,” inspire awe for their gentle nature and the rarity of spotting one in the wild. Closely related to manatees, dugongs (Dugong dugon) are the only surviving member of their family (Dugongidae), making them truly unique in the marine world.
In this article, we’ll dive into everything you need to know about dugongs—from where they live and what they eat, to their conservation status and where you might have the chance to see one in person.
What Is a Dugong?
At first glance, dugongs look like a cross between a dolphin and a manatee. They have a rounded, fusiform body, thick grayish skin, paddle-like forelimbs, and a broad, fluked tail much like that of a dolphin. Their most distinctive feature is a downturned, bristly snout perfectly designed for grazing seagrass.
Adult dugongs typically grow to around 2.5–3 meters long and weigh up to 400 kilograms. Despite their size, they move gracefully through shallow lagoons and coastal waters, often leaving behind feeding trails where they’ve cropped seagrass beds close to the seabed.
Dugongs vs. Manatees: Spotting the Difference
Dugongs and manatees share a common ancestor, but they’ve taken slightly different evolutionary paths. While manatees live in both salt and freshwater environments in the Atlantic, dugongs are strictly marine and are only found across the Indo-Pacific. Dugongs also have a dolphin-like fluke on their tail, while manatees have a broad, rounded paddle-shaped tail.
Another key difference: dugongs are generally more elusive than manatees, which makes seeing one in the wild all the more special.
Where Do Dugongs Live?
Dugongs have one of the broadest ranges of any marine mammal, spanning more than 40 countries and territories. However, their distribution is patchy because they depend entirely on healthy seagrass meadows for survival.
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Red Sea & East Africa – A stronghold for dugongs, with well-known populations around Egypt’s Marsa Alam and Abu Dabbab. Divers in these areas occasionally spot them while exploring coral reefs while diving in the Red Sea.
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Arabian Gulf & Indian Ocean – Found in waters off the UAE, Oman, India, and Sri Lanka.
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Southeast Asia – Small populations exist in the Philippines, Thailand, Malaysia, and Indonesia.
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Australia – The world’s largest population, with tens of thousands spread across Northern Australia, particularly in the Great Barrier Reef and Torres Strait.
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Western Pacific – Present around Papua New Guinea, New Caledonia, and the Solomon Islands.
Unfortunately, dugong numbers are declining across much of their range due to habitat loss, coastal development, and boat strikes.
What Do Dugongs Eat?
Dugongs are the only strictly herbivorous marine mammals. Their diet consists almost entirely of seagrass, which they graze on with their muscular, sensitive snouts. They use bristly hairs (called vibrissae) around their mouths to detect and grasp seagrass shoots.
By feeding, dugongs actually play a crucial role in maintaining the health of seagrass meadows. Their grazing prevents seagrass from becoming overgrown and stimulates regrowth, keeping these ecosystems balanced.
Behavior and Life Cycle
Dugongs are relatively slow-moving and can hold their breath for up to six minutes, though they usually surface more frequently. They tend to live in small, loose groups, although they may gather in larger herds when food is abundant.
Reproduction is slow, with females giving birth to a single calf after a year-long pregnancy. Calves remain with their mothers for up to 18 months, relying on both milk and seagrass. Because of this slow reproduction rate, dugong populations are especially vulnerable to decline.
Conservation Status
The International Union for Conservation of Nature (IUCN) lists the dugong as Vulnerable to extinction. In some areas, such as parts of Southeast Asia, they are now critically endangered or have disappeared entirely.
The main threats include:
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Habitat loss: Coastal development and destructive fishing practices damage seagrass beds.
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Boat strikes: Dugongs are often injured or killed by propellers when surfacing in shallow water.
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Fishing gear entanglement: Nets and lines pose a significant threat.
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Pollution: Runoff and sedimentation smother seagrass meadows, reducing food availability.
Conservation efforts focus on protecting seagrass habitats, creating marine sanctuaries, and raising awareness about responsible boating and fishing practices.
Where Can Divers See Dugongs?
Encountering a dugong while diving is an unforgettable experience. Here are some of the best-known hotspots:
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Marsa Alam & Abu Dabbab, Egypt (Red Sea): Probably the most famous dugong encounter site, where a few resident individuals are regularly spotted.
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Palawan & Bohol, Philippines: Rare but possible sightings in seagrass-rich bays.
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Great Barrier Reef, Australia: Home to the world’s largest dugong population, though sightings are still relatively uncommon due to their wide range.
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Sri Lanka & the Andaman Islands: Small, scattered populations persist, though encounters are unpredictable.
When diving in dugong habitats, patience is key. They are shy and easily disturbed, so sightings are always considered a lucky bonus.
Responsible Encounters: Diving with Dugongs
If you’re fortunate enough to see a dugong while diving or snorkeling, it’s vital to approach responsibly:
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Keep your distance – Maintain at least 10 meters and let the dugong approach you if it chooses.
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Stay calm and quiet – Avoid sudden movements or chasing.
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Don’t block their path – Dugongs need to surface to breathe and graze without obstruction.
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Respect seagrass beds – Avoid kicking up sediment with your fins, as this smothers the seagrass dugongs depend on.
By following these guidelines, divers help ensure that dugongs remain undisturbed and that future generations also have the chance to encounter them.
Why Dugongs Matter
Dugongs are more than just a rare and beautiful marine species. They are ecosystem engineers, shaping the health of seagrass meadows, which in turn provide food and habitat for countless other species—from sea turtles to fish nurseries. Protecting dugongs means protecting entire marine ecosystems.
For divers, seeing a dugong in the wild is both a privilege and a reminder of how interconnected ocean life truly is. With careful conservation and responsible tourism, we can help ensure these gentle sea cows continue to thrive in our oceans.
Final Thoughts
The dugong is a living link to the past, with a lineage stretching back 50 million years. Today, they face serious challenges, but they also inspire conservation efforts across their range. For divers, the chance to witness a dugong gliding over a seagrass meadow is a once-in-a-lifetime experience—a powerful encounter with one of the ocean’s most graceful giants.
Whether you’re scuba diving in the Red Sea, snorkeling in the Philippines, or exploring the Great Barrier Reef, keep your eyes peeled. You might just be lucky enough to spot a dugong, peacefully grazing in the shallows, reminding us all of the beauty and fragility of the marine world.