Mammals diurnal

Pacific White-sided Dolphin

Aethalodelphis obliquidens

The ultimate acrobat of the Pacific, this dolphin is known for its striking tri-color markings and its incredible displays of speed and agility. Whether they are bow-riding or leaping in the surf, they are a magnificent sight for any coastal observer.

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Quick Identification

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Size

5.5 to 8 feet (1.7 to 2.5 meters) in length; 330 to 440 lbs (150 to 200 kg) in weight

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Colors

Tri-colored pattern featuring a dark gray or black back, light gray sides, and a white belly; dorsal fin is bi-colored with a dark leading edge and light gray trailing edge

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Key Features

Strongly curved, bi-colored dorsal fin
Light gray 'suspenders' stripes running along the back
Blunt, short snout without a distinct beak
Highly acrobatic behavior including frequent leaping and spinning

When You’ll See Them

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Activity pattern diurnal

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Peak hours 8-11 AM and 3-6 PM

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Season Year-round, with higher coastal visibility during spring and summer

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Diet Small schooling fish such as herring, sardines, and anchovies, along with various species of squid; they often hunt cooperatively to corral prey.

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Habitat Temperate coastal and pelagic waters of the North Pacific, often found near the continental shelf or deep-water escarpments.

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Behavior

The Pacific White-sided Dolphin is widely regarded as one of the most playful and energetic cetaceans in the North Pacific. They are highly social animals, typically traveling in pods of 10 to 100 individuals, though they occasionally form 'super-pods' numbering in the thousands. Their surface behavior is spectacular, often involving high leaps, somersaults, and 'porpoising' at high speeds across the water.

These dolphins are exceptionally curious and are famous among mariners for their love of bow-riding. They will often divert their course to swim in the pressure wave created by a boat's hull. In the wild, they are frequently seen interacting with other species, such as California Sea Lions and Humpback Whales. While they are friendly toward vessels, they are efficient pack hunters that use sophisticated echolocation to navigate and locate prey in deep or murky waters.

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Camera Tips

Capturing the Pacific White-sided Dolphin on an AI-powered camera requires a setup optimized for high-speed action. Since these dolphins can travel at speeds exceeding 25 mph, you should prioritize a fast shutter speed or 'action mode' to prevent motion blur during breaches. If you are mounting a camera on a coastal pier or a boat, use a high-quality polarizing filter. This is essential for cutting through water surface glare, allowing your camera to capture the dolphin’s distinctive light gray 'suspenders' and white belly even when they are just beneath the surface.

For coastal 'backyard' observers with ocean-facing properties, mount your camera at an elevated angle. A higher vantage point reduces the distortion caused by waves and provides a better perspective of the pod's formation. Look for natural indicators of dolphin activity to trigger your recording, such as 'bait balls' or flocks of diving birds; these dolphins are often the primary force driving fish to the surface. Set your AI detection to look for high-contrast movement, as the splash of a breach is often the best trigger for a recording session.

Because salt spray is highly corrosive, ensure your camera is housed in an IP67-rated waterproof casing and wipe the lens regularly with a microfiber cloth. Early morning and late afternoon provide the best lighting, as the low sun angle highlights the texture of the dolphin's skin and the spray of their blowholes. If your camera supports it, use a telephoto lens (100mm or higher) to get close-up shots of the dorsal fins, which are as unique as human fingerprints and can be used for individual identification.

Similar Species

Species that look similar or are commonly confused with Pacific White-sided Dolphin.

Short-beaked Common Dolphin

Common Dolphins have a distinct yellow/tan 'hourglass' pattern on their sides, whereas the White-sided is strictly gray and white.

Northern Right Whale Dolphin

This species is much more slender and lacks a dorsal fin entirely, unlike the prominent fin of the White-sided Dolphin.

Dall's Porpoise

Dall's Porpoises have a stockier, 'rooster-tail' splash and a much smaller, triangular dorsal fin compared to the dolphin's curved fin.

Frequently Asked Questions

They are primarily diurnal, meaning they are most active during daylight hours. You are most likely to see them hunting or playing in the mid-morning and late afternoon when fish are closer to the surface.

While you cannot 'attract' them like backyard birds, they are drawn to areas with high concentrations of small schooling fish. Protecting local water quality and maintaining healthy kelp forests helps support the food chain that brings them closer to shore.

Their diet consists of small schooling fish like anchovies, hake, and herring, as well as squid. They are opportunistic feeders and often hunt in groups to make catching fish more efficient.

They are common in coastal suburban areas along the Pacific Northwest and California. If your 'backyard' overlooks the ocean or a deep-water bay, you have a good chance of spotting them from your deck.

Look at the dorsal fin and the side patterns. Pacific White-sided Dolphins have a very hooked, bi-colored dorsal fin and gray 'suspenders' on their back, whereas Common Dolphins have an 'hourglass' pattern of yellow and gray on their sides.

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