Fish Active day and night

Cowtail Stingray

Pastinachus sephen

iNaturalist Wikipedia

With its majestic flag-like tail and wide, diamond-shaped body, the Cowtail Stingray is a true icon of the Indo-Pacific shallows. A master of camouflage, it glides effortlessly through tropical lagoons and sandy estuaries.

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Quick Identification

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Size

Disc width up to 1.8 m (5.9 ft); total length can exceed 3 m (9.8 ft); weight up to 250 kg (550 lbs).

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Colors

Uniformly dark brown, grey, or olive on the upper surface; creamy white underside; distinctive black tail fold.

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Key Features

Large, flag-like ventral fold on the tail
Broad, diamond-shaped pectoral fin disc with rounded corners
Thick tail base containing one or two venomous spines
Eyes positioned on top of the head for buried observation

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 4-8 AM, 6-10 PM

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Season Year-round

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Diet A carnivorous bottom-feeder that eats small bony fish, crabs, shrimp, polychaete worms, and mollusks by vacuuming them from the sediment.

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Habitat Shallow coastal waters, estuaries, lagoons, and mangrove forests; occasionally ventures into freshwater rivers.

public Geographic range

Where Does the Cowtail Stingray Live?

The Cowtail Stingray is widely distributed across the tropical waters of the Indo-Pacific region. Its native range extends from the Red Sea and the eastern coast of Africa across the Indian Ocean to Southeast Asia and as far east as Micronesia and northern Australia. This species is particularly common in the coastal waters of India, Indonesia, and the Philippines, where it inhabits both coral reef peripheries and brackish mangrove environments.

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9 Countries

25M km² Range

Vulnerable Conservation

IN India ID Indonesia AU Australia TH Thailand PH Philippines ZA South Africa Saudi Arabia Vietnam MY Malaysia

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iNaturalist / Verified observation data

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Behavior

The Cowtail Stingray is a primarily solitary hunter that spends much of its time cruising sandy or muddy flats in search of prey. It is a bottom-dweller, often burying itself in the substrate with only its eyes and spiracles exposed to remain hidden from predators like large sharks. While generally shy, it is known for its distinctive swimming style where the large tail fold undulates like a flag, providing stability and possibly helping it maneuver in shallow waters.

When it comes to human interaction, these rays are not aggressive but are highly defensive if stepped on or cornered. They possess a potent venomous spine that can cause serious injury. In many coastal regions, they are accustomed to the presence of boats and may even frequent popular fishing piers or estuaries where discarded bait provides an easy meal. They are slow-growing and have low reproductive rates, making them particularly vulnerable to overfishing and habitat degradation.

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Camera Tips

Capturing the Cowtail Stingray requires specialized underwater equipment, as this species rarely surfaces. For coastal property owners or those with access to piers and docks, a waterproof action camera mounted on a weighted tripod or a long pole is the best approach. Place the camera in shallow, sandy areas during the incoming tide, which is when rays often move into the shallows to forage. Aim the lens horizontally across the sea floor, about 12 to 18 inches above the substrate, to capture their majestic wing movements as they glide past.

While we don't recommend heavy baiting, placing the camera near natural food sources like shellfish beds or using a small amount of crushed oily fish (like sardines) in a mesh bag can attract them into the frame. Ensure the camera is positioned to catch the side profile, as the most distinguishing feature—the large tail fold—is most visible from the side. Early morning and late afternoon provide the best natural light penetration through the water, reducing backscatter and graininess in your footage.

Be mindful of the tide and water clarity. After heavy rain, estuaries can become murky, which makes identification difficult. For the best results, wait for a calm day with clear water. If using a camera in a shallow mangrove or backyard canal, ensure the housing is marine-rated to prevent saltwater corrosion. High frame rates of 60fps or higher are ideal for capturing the fluid, waving motion of their tail fold in slow motion, which makes for spectacular viewing on EverydayEarth.

Similar Species

Species that look similar or are commonly confused with Cowtail Stingray.

Mangrove Whipray

Lacks the large tail fold and often has a white-spotted or granular-textured back.

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Frequently Asked Questions

Cowtail Stingrays are active both day and night, but they often show increased activity during tidal shifts. They are most frequently spotted foraging in the early morning and late evening when they move into shallow waters to hunt.

If you live on a coastal canal or estuary, you can attract Cowtail Stingrays by maintaining a healthy, natural shoreline. They are drawn to sandy bottoms with plenty of crustaceans. Avoid using harsh chemicals in your yard, as these run off into the water and deter the small prey animals that rays feed on.

These rays are carnivorous bottom-feeders. Their diet consists primarily of small fish, crabs, shrimp, mollusks, and marine worms which they suck up from the sand using their powerful mouths.

In many tropical coastal regions, Cowtail Stingrays are common in suburban canals, marinas, and near public piers. They are highly adaptable and will enter brackish water environments that are close to human development.

Look for the large, black, flag-like fold of skin on the underside of its tail. This fold is much larger than those on other stingrays and is very prominent when the ray is in motion. Its disc is also more diamond-shaped than the rounded Blue Spotted Ribbon Tail Ray.

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