Mammals Active day and night

Commerson's Dolphin

Cephalorhynchus commersonii

iNaturalist Wikipedia

Meet the 'Panda of the Sea,' a small, high-energy dolphin known for its striking black-and-white patterns and acrobatic displays. These social marine mammals are among the fastest swimmers in their size class and are a favorite for coastal wildlife observers.

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Quick Identification

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Size

Length: 1.2 to 1.75 metres (3.9 to 5.7 feet); Weight: 35 to 86 kg (77 to 190 lbs)

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Colors

Striking black head, dorsal fin, and tail; white body and throat; black 'tear-drop' patch on the belly

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Key Features

Bold black-and-white 'panda' coloration
Small, stocky build with no distinct beak
Rounded dorsal fin resembling a Mickey Mouse ear
Fast, acrobatic swimming style often involving leaps

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 6 AM - 8 PM for surface sightings

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Season Year-round; most visible during the austral summer (December-March)

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Diet Opportunistic feeders targeting small coastal fish (like hake and silversides), squid, octopus, and shrimp; occasionally grazes on marine algae.

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Habitat Shallow coastal waters, harbors, fjords, and river mouths; often found near giant kelp forests.

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Where Does the Commerson's Dolphin Live?

Commerson's Dolphin is native to the cold, southern waters of the Atlantic and Pacific oceans, primarily clustered around the tip of South America. They are commonly found along the coastlines of Argentina and Chile, as well as the coastal waters of the Falkland Islands. A secondary, isolated population thrives thousands of miles away in the southern Indian Ocean, specifically inhabiting the shallow waters surrounding the Kerguelen Islands.

Basemap © OpenStreetMap contributors

4 Countries

2.1M km² Range

Least Concern Conservation

AR Argentina CL Chile Falkland Islands French Southern and Antarctic Lands

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iNaturalist / Verified observation data

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Behavior

Commerson's Dolphins are famously high-energy cetaceans, often described as the 'gymnasts' of the ocean. They are incredibly fast swimmers, frequently seen riding the bow waves of boats or even the wakes of larger whales. Unlike many other dolphins, they often swim upside down, a behavior believed to help them better visualize prey against the surface or the seafloor while hunting in shallow waters.

These dolphins are highly social and typically travel in small pods of 2 to 10 individuals, though massive aggregations of over 100 have been recorded during feeding frenzies. They have an extremely high metabolism for their size, requiring them to eat roughly 10% of their body weight every day. In their interactions with humans, they are remarkably curious and will often approach vessels to play in the turbulence created by the propellers.

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Camera Tips

Capturing Commerson's Dolphin on camera requires speed and patience. If you are setting up a shore-based trail camera or an AI-powered coastal station, aim for a wide-angle view of shallow bays or harbor mouths where they are known to frequent. Because they move so quickly, use a high shutter speed—at least 1/2000th of a second—to freeze their jumps and splashes. A polarizing filter is essential for any coastal camera setup to cut through the water's surface glare and reveal the dolphin’s white body beneath the waves.

For those using AI-powered identification, the black-and-white patterning makes these dolphins ideal candidates for automated detection. Place cameras at an elevated angle on piers or cliffs to get a top-down view of their 'panda' markings. If you are using a waterproof action camera on a pole or buoy, focus on the 'kick' of the tail; Commerson's Dolphins are highly attracted to moving objects and may swim directly toward the lens out of curiosity.

Timing is everything. These dolphins are most active in near-shore areas during rising tides, as the moving water brings in higher concentrations of prey. Set your camera to burst mode or high-frame-rate video. In the early morning or late afternoon, the low sun angle can create harsh shadows on their black skin, so try to capture them during midday when the sun illuminates the white sections of their bodies for the best contrast.

Similar Species

Species that look similar or are commonly confused with Commerson's Dolphin.

Peale's Dolphin

Larger with more complex grey and white flanks and a tall, hooked dorsal fin.

Burmeister's Porpoise

Much shyer and darker in color with a low, triangular dorsal fin set further back on the body.

Orca

Significantly larger with a massive upright dorsal fin and different white patch placement behind the eye.

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Frequently Asked Questions

Commerson's Dolphins are active throughout the day and night due to their high metabolism. However, for surface viewing and camera capture, they are most easily spotted during daylight hours, particularly during rising tides when they follow prey into shallow coastal zones.

You cannot use bait for dolphins, but they are naturally attracted to movement. Setting up a camera near a boat wake or in a high-current area like a harbor mouth can increase your chances of a close encounter as they love to play in moving water.

They are opportunistic hunters that eat a variety of small fish, including hake and herring, as well as squid, shrimp, and octopus. They are even known to forage within kelp forests for small crustaceans.

They are not found in inland suburban areas, but they are very common in coastal 'backyards' in southern Argentina, Chile, and the Falkland Islands, often seen from docks and beachside homes.

Commerson's Dolphin has a sharp, high-contrast black-and-white pattern and a rounded dorsal fin. Peale's Dolphin is larger, primarily grey and black with more muted markings and a pointed, falcate dorsal fin.

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