Crustaceans Active at night

Atlantic Ghost Crab

Ocypode quadrata

iNaturalist Wikipedia

A master of camouflage and the fastest sprinter on the sand, the Atlantic Ghost Crab is the moonlit guardian of the Atlantic shoreline.

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Quick Identification

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Size

Carapace width 1.5–2 inches (3.8–5 cm); total leg span up to 6 inches (15 cm); weight 1–2 ounces.

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Colors

Pale straw-yellow, cream, or grayish-white; large black bulbous eyes; juveniles often exhibit mottled brown and white camouflage.

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Key Features

Square-shaped carapace with rounded edges
Large, club-like eyestalks with 360-degree vision
Asymmetrical claws (one larger than the other)
Long, hairy legs designed for high-speed sideways running

When You’ll See Them

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Activity pattern Active at night

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Peak hours 9 PM - 4 AM

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Season May-September

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Diet Omnivorous scavengers and active predators; they eat bean clams, mole crabs, insects, detritus, and occasionally sea turtle eggs or hatchlings.

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Habitat High-energy sandy beaches and coastal dunes, typically living between the high-tide mark and the primary dune line.

Behavior

Atlantic Ghost Crabs are the 'phantom' sprinters of the coastline, earned by their pale coloration that blends perfectly with dry sand and their incredible speed. Capable of moving at nearly 10 miles per hour, they dart sideways with sudden, erratic changes in direction to evade predators. They are primarily nocturnal, spending the heat of the day in deep, complex burrows that can extend four feet underground to reach the cooler, damp sand near the water table.

While they are terrestrial, these crabs are biologically tethered to the sea. They possess gills that must remain moist to function; they achieve this by wicking up moisture from damp sand or occasionally venturing into the surf to 'recharge' their gill chambers. Socially, they are quite territorial of their burrows and use a unique form of communication called stridulation—making rasping sounds by rubbing their claws against their legs—to warn off rivals or attract mates.

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Camera Tips

Capturing a Ghost Crab on camera requires a low-profile setup. Place your camera just 2 to 4 inches off the ground using a ground spike or a weighted sandbag. Position the lens about 3 feet away from a fresh burrow entrance—you can identify an active 'home' by the fan-shaped pile of fresh sand outside the hole. Angle the camera slightly upward to catch the crab’s iconic stalked eyes against the horizon.

Since these crabs are most active in total darkness, a camera with high-quality infrared (IR) flash is mandatory. They are sensitive to vibrations, so avoid heavy footfalls when checking your gear. Using a 'burst mode' or high-speed trigger is highly recommended, as their movements are lightning-fast and erratic; a single shot often misses the crab entirely as it darts back into its hole.

The beach environment is hostile to electronics. Salt spray and blowing sand can scratch lenses and corrode ports within hours. Always use a weather-sealed housing or a protective silicone sleeve. After a night of filming, wipe down the exterior of your camera with a damp, fresh-water cloth to remove salt residue. If you want to keep them in front of the lens longer, a small piece of oily fish or a cracked-open clam secured with a tent stake can act as an irresistible lure.

Similar Species

Species that look similar or are commonly confused with Atlantic Ghost Crab.

Sand Crab

Much smaller and egg-shaped, Sand Crabs lack the square body and long walking legs of the Ghost Crab.

Great Land Crab

Larger and typically blue or gray, Land Crabs prefer inland muddy burrows and mangroves rather than open sandy beaches.

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Frequently Asked Questions

Atlantic Ghost Crabs are primarily nocturnal. They emerge from their burrows shortly after sunset to forage and dampen their gills, remaining active until the pre-dawn hours to avoid both the heat of the sun and visual predators like gulls.

You can only attract Ghost Crabs if your property is directly adjacent to a sandy beach. Maintaining natural dune vegetation and reducing artificial night lighting (which disorients them) are the best ways to encourage them to burrow near your home.

They are opportunistic omnivores. Their diet includes small bivalves like bean clams, mole crabs, insects, and organic debris washed up by the tide. They are also known to scavenge dead fish and occasionally prey on sea turtle hatchlings.

They are only found in suburban areas that are immediately coastal. They require deep, soft sand for burrowing and proximity to salt water, so they are never found in inland suburban gardens or freshwater environments.

Ghost Crabs are much larger, square-shaped, and have long legs for running on top of the sand. Sand Crabs (or Mole Crabs) are small, egg-shaped, have no visible pincers, and live almost entirely buried within the shifting surf line.

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