Mammals diurnal

Indo-Pacific Bottlenose Dolphin

Tursiops aduncus

The Indo-Pacific Bottlenose Dolphin is the charismatic acrobat of the coastline, known for its intelligence and playful spirit. Often found just yards from the shore, these spotted-bellied beauties offer a front-row seat to the wonders of marine life.

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Quick Identification

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Size

Grows up to 2.6 meters (8.5 feet) in length and weighs up to 230 kilograms (510 pounds).

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Colors

Steel grey back transitioning to a light grey or near-white belly; mature adults feature distinctive grey speckling on their undersides.

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Key Features

Grey spotting on the belly of mature adults
Slightly longer and more slender rostrum than common bottlenose dolphins
Tall, curved (falcate) dorsal fin located mid-back
Streamlined, athletic build adapted for shallow coastal waters

When You’ll See Them

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Activity pattern diurnal

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Peak hours 7-10 AM and 3-6 PM, heavily influenced by local tide cycles

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Season Year-round, with peak visibility during calm sea conditions in summer months

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Diet A wide variety of reef fish, small squid, and bottom-dwelling crustaceans. They are opportunistic hunters that use echolocation to find prey buried in the sand or hiding in crevices.

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Habitat Shallow coastal waters, including tropical coral reefs, sandy-bottomed bays, estuaries, and protected lagoons.

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Behavior

The Indo-Pacific Bottlenose Dolphin is a highly social and remarkably intelligent marine mammal. They typically live in small to medium-sized pods of 5 to 15 individuals, though these groups are fluid, frequently merging and splitting in a social structure known as 'fission-fusion.' They are exceptionally active and playful, often seen leaping from the water, tail-slapping, or surfing in the pressure waves created by passing boats or large swells.

These dolphins are coastal specialists, staying much closer to the shore than their common bottlenose cousins. This proximity to land makes them one of the most frequently observed dolphin species from beaches and piers. They are known for cooperative hunting, where pod members work together to herd schools of fish into shallow water or against reefs, making them easier to catch. Their communication is a complex language of clicks, whistles, and pulsed sounds used for both navigation and social bonding.

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Camera Tips

To capture the Indo-Pacific Bottlenose Dolphin on a trail camera, you need a setup that overlooks the water, such as a private pier, jetty, or a balcony with a clear view of a lagoon or estuary. Mounting the camera at a height of 5 to 10 feet above the high-tide line is critical to protect the equipment from salt spray while providing an optimal downward angle to reduce surface reflection. Use a heavy-duty articulating mount to ensure you can tilt the camera precisely toward the 'break' where waves peak or where dolphins are known to transit.

Lighting is your biggest challenge when filming over water. Midday sun creates intense glare that can blow out your image and obscure the dolphin's features. Aim for early morning or late afternoon shots when the sun is at an angle. If your camera setup allows for it, using a CPL (Circular Polarizing) filter over the lens is a game-changer; it cuts through surface reflections and allows the camera to see 'into' the water, revealing the dolphin's body rather than just its dorsal fin. Set your camera to a high-speed video mode (60fps if possible) because dolphins move with incredible speed and fluidity.

Because you cannot 'bait' dolphins in the traditional sense, you must rely on environmental cues. Set your camera to trigger during rising tides, which is when these dolphins are most likely to follow schools of fish into shallow coastal zones. Use a camera with a very fast trigger speed (0.2s or 0.3s) to ensure you don't just capture the splash after a jump. If you are using a PIR (passive infrared) sensor, be aware that it may not trigger well through water; instead, use a camera with 'Time Lapse' mode or 'Scheduled Recording' during peak activity hours to ensure you catch the action.

Maintenance in a marine environment is vital. Salt air will corrode electronics and cloud lenses within days. Use a waterproof housing even if the camera is 'weather-resistant,' and apply a rain-repellent solution (like Rain-X) to the lens cover to prevent water spots from ruining your footage. Wipe the lens with a soft, damp cloth once a week to remove salt buildup. Positioning the camera near natural bottlenecks, like the mouth of a bay or a narrow channel between sandbars, will significantly increase your hit rate.

Similar Species

Species that look similar or are commonly confused with Indo-Pacific Bottlenose Dolphin.

Common Bottlenose Dolphin

Larger and more robust with a shorter beak and no spots on the belly.

Australian Humpback Dolphin

Features a characteristic 'hump' below the dorsal fin and is generally slower-moving and less prone to leaping.

Frequently Asked Questions

They are generally most active during daylight hours, particularly in the early morning and late afternoon. However, their activity is often dictated by the tide; they are most likely to be seen close to shore during a rising tide when fish are pushed into shallower waters.

You should never feed or bait wild dolphins, as it is harmful to their health and often illegal. To encourage sightings, maintain a healthy marine environment by avoiding chemical runoff. They are naturally drawn to areas with high fish populations, such as healthy reefs and clean estuaries.

They have a varied diet consisting mostly of small fish, squid, and crustaceans. They are skilled hunters that use echolocation to find prey and often work in groups to corner schools of fish against the shore or underwater obstacles.

Yes, if those suburban areas are located along the coasts of the Indian or Western Pacific Oceans. They are very comfortable in shallow, human-populated coastal zones, often appearing in canals, near boat ramps, and off suburban beaches.

The most reliable giveaway is the spotting on the belly of mature Indo-Pacific Bottlenose Dolphins, which common bottlenose dolphins lack. They are also generally smaller, with a longer, more slender beak and a more streamlined body shape.

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