Mammals diurnal

Australian Humpback Dolphin

Sousa sahulensis

The ghost of the estuaries, the Australian Humpback Dolphin is a master of the shallows. With its unique dorsal hump and shy personality, it is a prized sighting for any coastal observer.

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Quick Identification

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Size

Length: 2.5–2.7 meters (8.2–8.9 ft); Weight: 230–260 kg (500–570 lbs)

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Colors

Lead-gray to dark gray on the upper body, fading to a lighter gray or white on the belly; older adults often develop white or pinkish patches on the dorsal fin and tail.

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Key Features

Distinctive fatty hump beneath the dorsal fin
Small, triangular dorsal fin located on top of the hump
Long, slender beak
Broad flukes with a deep median notch

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6-10 AM and 3-6 PM, though movements are heavily influenced by tidal cycles

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Season Year-round, with increased sightings during the calm, clear waters of the dry season (May-October)

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Diet A variety of coastal and estuarine fish, including mullet, bream, and tailor, as well as cephalopods like squid and cuttlefish. They often hunt by herding fish into shallow water or against mangroves.

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Habitat Tropical and subtropical coastal waters, shallow estuaries, river mouths, and mangrove forests, rarely venturing further than a few kilometers from shore.

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Behavior

Australian Humpback Dolphins are known for their shy and somewhat elusive nature compared to more gregarious dolphin species. They typically travel in small, tight-knit groups of three to five individuals, though larger 'super-groups' may form temporarily in areas with abundant food. While they are capable of acrobatic leaps, they are generally less likely to bow-ride or approach vessels, preferring to maintain a respectful distance from human activity.

Socially, they exhibit a 'fission-fusion' society where group memberships change frequently throughout the day. They are highly vocal, using a complex array of whistles and clicks for both communication and echolocation to navigate the often murky waters of tropical estuaries. During the heat of the day, they may be seen resting in quiet bays, but they remain vigilant for predators like tiger sharks.

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Camera Tips

To capture the Australian Humpback Dolphin on a coastal trail camera, your best bet is a high-vantage mounting point. If your 'backyard' overlooks a bay or estuary, secure your camera to a sturdy balcony railing or a pier piling. Angle the lens downward at about 15-20 degrees to minimize sun glare off the water while maximizing the field of view across the surface. Because these dolphins are most active during rising or high tides, avoid relying solely on motion triggers; instead, set your camera to time-lapse mode or schedule recordings during the two hours surrounding high tide.

Technical settings are crucial for marine photography. Use a high shutter speed or a 60fps video setting to prevent motion blur when the dolphin breaks the surface for air. If your camera allows for it, a CPL (Circular Polarizing) filter is the single best accessory you can add—it cuts through the surface shimmer and reflection, allowing the AI to better distinguish the dolphin's dorsal hump from the surrounding waves. This is especially helpful in the bright, midday sun typical of Northern Australian coasts.

Placement location is everything. Look for 'choke points' such as narrow channels between sandbars or the edges of mangrove forests where dolphins are forced to swim closer to the shore. Unlike bottlenose dolphins, the Australian Humpback Dolphin has a very low-profile surfacing style, barely lifting its head. Ensure your camera is set to capture high-definition video so you can zoom in during review to identify the characteristic scarring and speckling on the dorsal fin that distinguishes individuals.

Similar Species

Species that look similar or are commonly confused with Australian Humpback Dolphin.

Indo-Pacific Bottlenose Dolphin

Lacks the fatty hump beneath the dorsal fin and is generally more social and likely to bow-ride near boats.

Australian Snubfin Dolphin

Has a very blunt, rounded head with no beak and a much smaller, nub-like dorsal fin.

Frequently Asked Questions

While technically diurnal, their activity is more dependent on the tides than the clock. They are most frequently seen foraging in estuaries during the rising tide when fish are pushed into the mangroves, usually in the early morning or late afternoon.

You cannot 'attract' dolphins with food as it is illegal and harmful. The best way to encourage their presence is by maintaining a healthy coastal environment—reducing runoff and protecting local mangroves ensures a healthy fish population, which naturally brings the dolphins closer to your shore.

They are opportunistic feeders that primarily target estuarine fish like mullet and bream. They are also known to hunt for squid and cuttlefish along the sandy bottoms of shallow bays.

They are frequently spotted in coastal towns and cities across Northern Australia, particularly in places like Moreton Bay, Gladstone, and near the mouth of the Brisbane River, provided the water is relatively shallow.

The easiest way is to look at the dorsal fin. Humpback dolphins have a distinct fatty hump that the fin sits upon, whereas Bottlenose Dolphins have a fin that rises directly from their back. Humpback dolphins also have a much longer, narrower beak.

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