Sharks Active at night

Tawny Nurse Shark

Nebrius ferrugineus

iNaturalist Wikipedia

The Tawny Nurse Shark is a social, nocturnal hunter of the Indo-Pacific reefs, famous for its ability to 'vacuum' prey out of the tightest crevices. A peaceful giant by day, it transforms into a powerful and precise predator under the cover of darkness.

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Quick Identification

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Size

Typically 2.3 to 2.9 metres (7.5 to 9.5 feet) long; maximum recorded length of 3.2 metres (10.5 feet). Weight can reach up to 130 kg (286 lbs).

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Colors

Uniform sandy brown to yellowish-tan, capable of shifting to a darker grey or brown to blend with surroundings. No distinct spots or markings in adults.

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Key Features

Sickle-shaped (falcate) pectoral fins
Small spiracles located just behind the eyes
Two dorsal fins positioned far back on the body
Prominent barbels near the nostrils used for sensing prey

When You’ll See Them

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Activity pattern Active at night

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Peak hours 8 PM - 4 AM

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Season Year-round

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Diet A specialized suction feeder that consumes bottom-dwelling invertebrates including lobsters, crabs, and sea urchins, as well as octopuses and small reef fish.

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Habitat Shallow tropical waters including coral reefs, lagoons, seagrass beds, and sandy flats near the shore.

Behavior

The Tawny Nurse Shark is a primarily nocturnal species known for its sluggish daytime behavior. During the day, these sharks are often found resting in large groups, sometimes stacked on top of one another, inside reef caves or under shaded ledges. Unlike many other shark species, they can remain perfectly still because they are able to pump water over their gills manually through a process called buccal pumping.

When night falls, they become active hunters, using a specialized 'suction' feeding method. They press their mouths against crevices in the reef and expand their throat cavity to create a powerful vacuum, effectively sucking out hidden prey. While they are generally considered docile and non-aggressive toward humans, they are powerful animals and should be treated with respect; they can deliver a very strong, vice-like bite if they feel cornered or are harassed by divers.

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Camera Tips

To capture the Tawny Nurse Shark on an underwater trail camera, focus your efforts on 'high-traffic' reef corridors or the entrances to known resting caves. These sharks are creatures of habit and will often return to the same rocky overhang every day to sleep. For the best results, position your camera 12 to 18 inches off the seabed, tilted slightly upward. This angle ensures you capture the shark's distinctive sickle-shaped fins and the sensory barbels near its mouth as it cruises low over the substrate.

Since this species is most active after dark, your camera's infrared (IR) capabilities are critical. Use a camera with a 'no-glow' IR flash to avoid startling the shark or its prey, as bright lights can sometimes cause them to steer clear of the area. If you are placing a camera near a private dock or in a coastal 'backyard' setting, try to find a spot where the current naturally brings scent—these sharks have an incredible sense of smell and will follow a trail for long distances.

Baiting is a highly effective way to bring a Tawny Nurse Shark into your camera’s frame. A perforated 'scent bucket' or a secured PVC pipe filled with oily fish like sardines can keep a shark occupied in front of the lens for several minutes. Set your camera to record 20-30 second video clips rather than still images; this allows you to see their unique suction-feeding behavior, which is much more dynamic than a simple photo can convey. Ensure your housing is securely weighted, as these sharks are strong enough to accidentally nudge or displace a light camera rig while foraging.

Similar Species

Species that look similar or are commonly confused with Tawny Nurse Shark.

Nurse Shark

Found in the Atlantic; has rounded pectoral fins compared to the sickle-shaped fins of the Tawny Nurse Shark.

Grey Reef Shark

A more active swimmer that must keep moving to breathe, with a classic 'shark' profile and distinct black edging on the tail.

Zebra Shark

Features a much longer tail (nearly half its body length) and a spotted pattern as an adult, unlike the uniform color of the Tawny Nurse.

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Frequently Asked Questions

Tawny Nurse Sharks are nocturnal, meaning they are most active during the night. They spend their nights foraging across the reef and sandy flats, while their daylight hours are typically spent resting in caves or under ledges.

If you live in a coastal area within their range, you can attract Tawny Nurse Sharks by providing a scent trail. Using a mesh bag or perforated tube filled with oily fish scraps (like tuna or mackerel) near a dock or reef edge can draw them in, as they have a highly developed sense of smell.

They primarily eat bottom-dwelling creatures. Their diet includes crustaceans like crabs and lobsters, various mollusks, sea urchins, and occasionally small fish or octopuses that hide in reef crevices.

While not common in typical inland suburbs, they are frequently found in 'suburban' coastal environments, such as around piers, docks, and artificial reef structures in tropical regions like Queensland, Australia, or the Maldives.

You can tell them apart by their fins; the Tawny Nurse Shark has sickle-shaped (falcate) pectoral fins, whereas the Atlantic Nurse Shark has more rounded fins. Additionally, Tawny Nurse Sharks are only found in the Indo-Pacific, while the standard Nurse Shark is found in the Atlantic and East Pacific.

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