Mammals diurnal

Irrawaddy Dolphin

Orcaella brevirostris

The Irrawaddy dolphin is the 'smiling' guardian of Southeast Asia’s great rivers and coasts. With its unique beakless profile and gentle disposition, this rare mammal offers a glimpse into the incredible adaptability of aquatic life.

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Quick Identification

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Size

2–2.75 m (6.6–9 ft) in length; 90–200 kg (200–440 lb) in weight

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Colors

Uniform slate gray to slate blue on the back and sides, with a slightly paler underbelly; no distinctive spots or stripes.

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Key Features

Blunt, rounded forehead with no protruding beak
Small, triangular dorsal fin with a rounded tip
Broad, paddle-like flippers
Flexible neck allowing for greater head movement

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6-10 AM, 3-6 PM

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Season Year-round (though easier to spot during the dry season in river systems)

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Diet A generalist feeder that consumes various species of fish, crustaceans (like shrimp), and cephalopods (squid and octopus) found in both riverbeds and coastal waters.

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Habitat Shallow coastal waters, mangrove-lined estuaries, and large freshwater river systems.

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Behavior

Irrawaddy dolphins are known for their shy and elusive nature, rarely performing the acrobatic leaps or bow-riding behaviors common in other dolphin species. Instead, they typically surface with a low, gentle roll, showing only their blowhole and a small portion of their back. They are social animals, usually found in small pods of 3 to 6 individuals, though they may congregate in larger groups in areas with high food density.

One of their most fascinating behaviors is "spitting"—squirting a stream of water up to 1.5 meters into the air. This is believed to be a hunting tactic used to herd fish or clear silt from the water. In several regions, they have developed a famous cooperative relationship with local fishermen, where the dolphins drive fish into nets in exchange for a portion of the catch. Despite this interaction, they remain sensitive to human noise and habitat disturbance.

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Camera Tips

Capturing the Irrawaddy dolphin on camera is a challenge that requires patience and specific technical adjustments. For shore-based setups, place your camera on an elevated tripod or mount overlooking deep river bends or known "deep pools" where dolphins retreat during low tide or the dry season. Use a lens with a polarizing filter to reduce surface glare from the water, which is essential for the AI to distinguish the dolphin’s gray skin from the reflective surface of the river or sea.

If you are using underwater housing or a pier-mounted submersible camera, position it near structures like bridge pilings or submerged rock faces where fish congregate. Irrawaddy dolphins use echolocation to navigate, so ensure your equipment does not emit any high-frequency electronic noise that might startle them. High-speed shutter settings (1/1000s or faster) are necessary to capture clear images of their brief surfacing moments, as they rarely stay above water for more than a second or two.

Video mode is often superior to still photography for this species. Set your camera to record 10-20 second clips triggered by motion. This increases your chances of capturing their unique "spitting" behavior or the gentle roll of their dorsal fin. Because they are most active during the "golden hours" of early morning and late afternoon, ensure your camera has a high dynamic range (HDR) setting to handle the high-contrast lighting transitions over the water.

Avoid using traditional white-light flashes at night, as this can be extremely disruptive to their natural behavior. If you are monitoring a coastal area at night, rely on high-quality long-range infrared (IR) sensors. Finally, because these dolphins are often found in murky estuarine water, the EverydayEarth AI works best when the camera is angled 30-45 degrees relative to the water surface to capture the distinctive rounded profile of the dolphin's head as it breaks the plane.

Similar Species

Species that look similar or are commonly confused with Irrawaddy Dolphin.

Australian Snubfin Dolphin

Nearly identical in appearance but found only near Australia; it has a slightly different dorsal fin shape and a three-toned skin color pattern.

Finless Porpoise

Lacks a dorsal fin entirely and is generally smaller and more streamlined than the Irrawaddy dolphin.

Indo-Pacific Humpback Dolphin

Much longer beak and often appears pinkish or white, unlike the blunt-headed, gray Irrawaddy dolphin.

Frequently Asked Questions

Irrawaddy dolphins are primarily diurnal, meaning they are active during daylight hours. They are most frequently spotted in the early morning and late afternoon when fish activity is highest and boat traffic is often lower.

Unlike garden wildlife, you cannot 'bait' dolphins. However, you can encourage their presence by maintaining healthy, unpolluted waterways and preserving natural mangroves or riverbanks that support the fish and crustaceans they eat.

They are opportunistic hunters that eat a wide variety of prey including small fish, shrimp, krill, and occasionally squid. They often forage near the bottom of riverbeds or coastal floors.

They are not found in typical suburban backyards unless you live directly on a major river or estuary in South or Southeast Asia. Even then, they are rare and often endangered, appearing only in specific protected or remote habitats.

The easiest way to tell them apart is the dorsal fin. Irrawaddy dolphins have a small, visible dorsal fin, whereas Finless Porpoises have a flat ridge instead of a fin. Additionally, Irrawaddy dolphins have more rounded flippers.

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