Mammals Active at night

Cayenne Spiny Rat

Proechimys guyannensis

iNaturalist Wikipedia

Meet the Cayenne Spiny Rat, a master of the Amazonian understory known for its bristly coat and clever survival tactics. A frequent visitor to nocturnal trail cameras, this resilient rodent is a key player in the health of South American rainforests.

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0 Habitats

Quick Identification

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Size

Body length 17-25 cm (6.7-9.8 in); tail length 12-18 cm (4.7-7.1 in); weight 200-400g (7-14 oz)

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Colors

Reddish-brown to gray-brown upperparts with darker spines; creamy white underparts and feet

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Key Features

Flattened, stiff spines mixed with soft fur on the back
Tail shorter than head-body length and breaks easily
Large, prominent eyes and rounded ears
Pale, nearly white belly and chest

When You’ll See Them

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Activity pattern Active at night

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Peak hours 9 PM - 3 AM

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Season Year-round

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Diet Omnivorous, focusing on fallen fruits, seeds, palm nuts, fungi, and occasionally small insects found in the soil.

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Habitat Primary and secondary tropical rainforests, forest edges, and rural gardens with dense undergrowth.

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Where Does the Cayenne Spiny Rat Live?

This species is a quintessential resident of the Guiana Shield and the northern Amazon Basin in South America. It is natively found across a broad swathe of territory including French Guiana, Guyana, Suriname, and northern Brazil, with its range extending westward into southern Venezuela and eastern Colombia. It is most at home in lowland environments where humidity is high and the forest floor is thick with organic debris.

Basemap © OpenStreetMap contributors

6 Countries

2.5M km² Range

Least Concern Conservation

BR Brazil French Guiana GY Guyana SR Suriname VE Venezuela CO Colombia

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iNaturalist / Verified observation data

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Behavior

The Cayenne Spiny Rat is a terrestrial, nocturnal rodent that spends its nights navigating the complex landscape of the forest floor. While its name suggests a prickly nature, its 'spines' are actually modified, stiffened hairs that lay flat against the body, providing a coarse texture that acts as a deterrent to some predators. They are primarily solitary creatures, establishing small home ranges where they forage along well-worn paths in the leaf litter.

One of the most remarkable behaviors of this species is tail autotomy. Like some lizards, the Cayenne Spiny Rat can shed its tail if grabbed by a predator. The tail does not regenerate, meaning many adults in the wild are found with short, blunt stumps. They are cautious but adaptable, often living in close proximity to human agricultural sites where they take advantage of fallen crops and seeds.

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Camera Tips

To successfully capture the Cayenne Spiny Rat on camera, placement is everything. You must position your camera extremely low—ideally 15 to 20 centimeters (6-8 inches) off the ground. These rats are strictly terrestrial and follow 'runways' or clearings under fallen logs and dense ferns. Aim the camera horizontally along the forest floor to capture their profile, which is necessary to see the distinctive spiny texture of their fur.

Because they are highly active in total darkness, a 'No-Glow' or high-quality infrared flash is essential. Standard white light flashes or even some 'Low-Glow' LEDs can startle these rodents, causing them to bolt and potentially avoid the area for several days. If you are using a bait to attract them, a mixture of peanut butter and tropical fruits like mango or banana works wonders. Smear a small amount on a log or a flat rock to keep them in the frame long enough for a clear identification.

Set your camera to a fast trigger speed and high sensitivity. Because they move with a 'scurry-and-stop' motion, short video clips of 10-15 seconds are much more effective than still photos for identifying the species and observing their tail status. If you are placing cameras near a home or farm, look for areas with dense leaf litter and overhead cover, as they rarely cross wide-open spaces where they are vulnerable to owls.

Similar Species

Species that look similar or are commonly confused with Cayenne Spiny Rat.

Tome's Spiny Rat

Found more frequently in Central America and the Andean foothills; they look nearly identical but occupy different geographical niches.

Black Rat

The Black Rat has much longer, thinner tails and lacks the specialized spiny hairs and white underparts of the Cayenne Spiny Rat.

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Frequently Asked Questions

The Cayenne Spiny Rat is strictly nocturnal. They begin their activity shortly after dusk and remain active until just before dawn, with peak foraging occurring between 9 PM and 3 AM.

To attract them, maintain areas of dense ground cover and leaf litter. You can also use 'scent stations' with fallen fruit or peanut butter, placed near logs or thickets where they feel safe from predators.

Their diet is diverse and opportunistic, consisting mostly of fallen fruit, nuts, and seeds. They also consume fungi and small invertebrates, helping to cycle nutrients in the forest soil.

Yes, they are quite adaptable and frequently move into suburban gardens, orchards, and farms that are located near the edges of tropical forests or wooded corridors.

The best way is to look for the stiff, flattened spines on their back and a tail that is noticeably shorter than their body. Many adults will also have a missing tail, a unique feature of the Proechimys genus.

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