Mammals Active at night

Brown Rat

Rattus norvegicus

iNaturalist Wikipedia

Master of adaptation and urban survival, the Brown Rat is a fascinating neighbor often hidden just out of sight. From complex burrowing systems to high-intelligence social lives, these rodents offer a unique window into the wildlife that lives right alongside us.

0 Sightings

0 Habitats

Quick Identification

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Size

Body length: 20–28 cm (8–11 in); Tail: 15–23 cm (6–9 in); Weight: 140–500 g (5–18 oz)

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Colors

Coarse brown or greyish-brown fur on the back, transitioning to a lighter grey or pale yellow on the belly; tail is dark on top and lighter underneath.

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Key Features

Stocky body with a blunt snout
Small, hair-covered ears
Thick, scaly tail that is shorter than the combined head and body length
Dark, bead-like eyes and prominent whiskers

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 Year-round

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Diet A true opportunistic omnivore that will eat almost anything. They prefer grains, seeds, and fruit but frequently consume meat, insects, pet food, and household food waste.

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Habitat Highly adaptable; found in urban sewers, basements, suburban gardens, farmyards, and near waterways or coastal areas.

public Geographic range

Where Does the Brown Rat Live?

Originally native to the temperate regions of Northern China and Mongolia, the Brown Rat has become one of the most successful invasive species in history by hitching rides on human trade ships. Today, they are found on every continent except Antarctica, thriving wherever human populations provide a steady supply of food and shelter. In North America and Europe, they are the dominant rat species, having successfully naturalized in virtually every city, town, and agricultural region across the globe.

Basemap © OpenStreetMap contributors

10 Countries

100M km² Range

Least Concern Conservation

CN China US United States GB United Kingdom IN India DE Germany FR France CA Canada AU Australia JP Japan BR Brazil

Elevation range

0 m1,000 m2,000 m4,000 m

Sea level – 2,000 m

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iNaturalist / Verified observation data

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Behavior

Brown Rats are highly intelligent, social creatures that typically live in hierarchical colonies. They are primarily nocturnal, spending their nights foraging for food and exploring their environment. Known for their remarkable adaptability, they have developed a keen sense of "neophobia"—a cautious suspicion of new objects in their environment—which helps them avoid traps and predators in urban settings.

These rodents are exceptional diggers and often create complex burrow systems with multiple entrances and exit holes. Despite their reputation, they are meticulous groomers and maintain a high level of social interaction within their groups, communicating through ultrasonic vocalizations and scent marking. In human-dominated landscapes, they exhibit commensal behavior, expertly navigating sewers, basements, and garden structures to find resources.

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Camera Tips

To capture Brown Rats on camera, placement is everything. These rodents are creatures of habit and usually travel along "rat runs"—established paths that follow vertical edges like garden walls, fences, or the foundations of houses. Position your camera about 2 to 4 inches off the ground, angled parallel to a wall or fence line rather than pointing directly at it. This increases the chances of capturing the animal in profile as it scampers by.

Because rats are naturally suspicious of new objects (neophobia), it may take several days for them to become comfortable with your camera. Avoid moving the camera frequently. For the best results, use a "No-Glow" or black-LED infrared flash. Brown Rats have excellent night vision and can sometimes be spooked by the faint red glow of standard IR cameras, which might cause them to avoid the area in the future.

High-scent lures are incredibly effective for drawing them into the frame. A small smear of peanut butter or a handful of birdseed placed about 3 to 5 feet from the lens works wonders. Try to place the bait near a small piece of cover, like a log or a brick; rats feel safer eating when they aren't in the wide open. Set your camera to a high-sensitivity trigger and use "Burst Mode" or short 10-second video clips, as these animals move very quickly and can be gone in a flash.

Similar Species

Species that look similar or are commonly confused with Brown Rat.

Black Rat

Smaller and more slender with ears that can be pulled over the eyes and a tail longer than the body.

House Mouse

Significantly smaller (about 1/10th the weight) with much larger ears relative to its head size.

Muskrat

Much larger and semi-aquatic with a vertically flattened tail used for swimming.

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Frequently Asked Questions

Brown Rats are primarily nocturnal, meaning they are most active during the night. Their activity usually peaks a few hours after sunset and again shortly before dawn, though they may occasionally emerge during the day if food is scarce or if the colony is overpopulated.

If you want to see them on camera, provide high-energy food sources like peanut butter, sunflower seeds, or dry pet food. Placing these near sheltered areas like woodpiles, compost heaps, or along the edges of garden sheds will make them feel secure enough to visit.

They are opportunistic omnivores. In a backyard setting, they eat fallen birdseed, ripening vegetables, fruit, and insects. In urban environments, they rely heavily on human food scraps and poorly secured trash.

Yes, they are extremely common in suburban environments. They thrive in gardens that provide plenty of cover, access to water, and proximity to bird feeders or pet food bowls.

The Brown Rat is larger and stockier with a blunt snout and a tail shorter than its body. In contrast, the Black Rat (Ship Rat) is more slender with a pointed snout, larger ears, and a tail that is longer than its head and body combined.

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