Rodent identification guide

Know what you're dealing with

Mice, rats, and other rodents are common in the Texarkana area — and each species behaves differently. Correct identification is the first step toward effective control.

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Close-up of rodent damage to wood framing in a home

Common rodents in East Texas

Species identification

Three rodent species account for the vast majority of structural infestations in the Texarkana area. Here's how to tell them apart.

Mus musculus

House Mouse

Size2.5–3.5 inches body length

ColorLight gray to brown with a lighter underside

EarsLarge, prominent ears relative to body size

TailThin, scaly tail as long as the body

DroppingsRod-shaped, 1/8–1/4 inch, pointed ends

HabitatIndoors year-round; nests in wall voids, insulation, and cabinet interiors

Warning signs

Gnaw marks on food packaging, droppings along walls and in cabinets, musky odor, shredded nesting material

Risk to your property

Contaminates food and surfaces; can chew through wiring; reproduces rapidly — a single pair can produce 50+ offspring per year

Rattus norvegicus

Norway Rat

Size7–9 inches body length

ColorBrown with scattered black hairs; gray-white underside

EarsSmall ears close to the head

TailThick, scaly tail shorter than the body

DroppingsCapsule-shaped, 3/4 inch, blunt ends

HabitatBurrows in soil near foundations, under slabs, in crawl spaces, and along drainage areas

Warning signs

Burrow entrances near the foundation, gnaw marks on wood and pipes, grease marks along walls, droppings near food sources

Risk to your property

Structural damage from burrowing; gnaws through pipes, wiring, and concrete block; carries leptospirosis and other pathogens

Rattus rattus

Roof Rat

Size6–8 inches body length

ColorBlack to dark brown with a lighter underside

EarsLarge ears relative to body size

TailLong, thin tail longer than the body

DroppingsSpindle-shaped, 1/2 inch, pointed ends

HabitatAttics, rafters, wall voids, and trees; enters through roofline gaps and overhanging branches

Warning signs

Noise in attic at night, gnaw marks on roof framing and wiring, droppings in attic insulation, grease marks on rafters

Risk to your property

Damages attic insulation and wiring; a leading cause of electrical fires; carries fleas that transmit disease

What to look for

Signs of rodent activity

Rodents are nocturnal and secretive — by the time you see one during the day, the population is already significant. Learn to read the early warning signs.

Droppings

Fresh droppings are dark and moist; older droppings are dry and gray. Location matters: droppings concentrated in one area indicate a nesting or feeding site nearby. Count and note locations before cleanup — this information helps your inspector assess the severity and species.

Gnaw marks

Rodents gnaw constantly to keep their teeth worn down. Fresh gnaw marks are light-colored and rough; older marks are darker and smooth. Large, rough marks suggest rats; small, clean marks suggest mice. Check baseboards, door frames, food packaging, and utility lines.

Grease marks and runways

Rodents travel the same routes repeatedly, leaving dark grease marks from their fur along walls, pipes, and beams. These "runways" are most visible on light-colored surfaces and in dusty areas. A clear runway indicates regular, ongoing activity.

Nesting material

Rodents build nests from shredded paper, insulation, fabric, and plant material. Nests are typically found in dark, undisturbed areas: inside wall voids, behind appliances, in attic insulation, and in crawl space corners. A nest with young indicates an established breeding population.

Sounds

Scratching, gnawing, and scurrying sounds in walls, ceilings, and floors — especially at night — are a reliable indicator of rodent activity. Roof rats are most active in attics; Norway rats are more commonly heard in crawl spaces and lower wall voids.

Odor

A persistent musky or ammonia-like odor in enclosed spaces — under sinks, in crawl spaces, in attics — indicates a significant rodent population. The odor comes from urine, which rodents deposit continuously along their travel routes.

How they get in

Common entry points

Understanding how rodents enter your structure is essential for effective exclusion. Mice can squeeze through a gap the size of a dime. Rats need only a quarter-inch opening. Every structure has vulnerabilities — the question is whether they've been found.

Foundation gaps

Cracks in foundation walls, gaps where pipes and conduit penetrate the foundation, and openings where the sill plate meets the foundation are primary entry points for Norway rats and mice.

Roofline and soffits

Roof rats enter through gaps where the roof deck meets the fascia, damaged soffit panels, and unscreened gable and soffit vents. Overhanging tree branches provide direct access to the roofline.

Utility penetrations

Gaps around pipes, conduit, and wiring where they pass through walls and floors are among the most common and most overlooked entry points in both residential and commercial structures.

Doors and garage

Worn door sweeps, damaged weatherstripping, and gaps at the sides and top of garage doors allow mice to enter easily. The door between the garage and the living space is a critical control point.

Vents without screens

Foundation vents, crawl space vents, and dryer vents without intact screens are direct entry points. Dryer vent caps that don't close fully when the dryer is off are a common mouse entry point.

Ready to act?

Identification is step one. Elimination is step two.

If you're seeing signs of rodent activity, a professional inspection will confirm the species, locate entry points, and give you a clear treatment and exclusion plan.

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