How do you tell a mouse from a rat?
Size and proportion settle it quickly. A house mouse has a body around 3 to 4 inches with a slender tail as long as its body and a small head; a rat has a body roughly 7 to 9 inches with a noticeably thicker tail, larger feet and a heavier head.
Along the Gulf Coast the three species people encounter indoors are the house mouse, the roof rat and the Norway rat. Cotton rats also occur locally but are primarily outdoor field rodents. If you never see the animal, droppings and the location of the activity are usually enough to narrow it down.
What do mouse droppings look like compared with rat droppings?
Mouse droppings are small, roughly 1/8 to 1/4 inch, dark and pointed at the ends. Rat droppings are much larger — about 1/2 to 3/4 inch — and their shape differs by species.
- House mouse: 1/8–1/4 inch, rice-grain shaped, scattered widely, often dozens in a small area
- Roof rat: about 1/2 inch, curved and pointed at both ends, frequently found in attics and along rafters
- Norway rat: about 3/4 inch, blunt and capsule-shaped, usually found lower in the structure
- Fresh droppings look dark and soft; older droppings dry, gray out and crumble
Do not sweep or vacuum dry droppings. Follow CDC guidance on cleaning rodent-contaminated areas, which recommends ventilating, wetting the material with disinfectant and wearing gloves.
Which rodent lives in the attic and which stays low?
Roof rats are climbers and commonly use attics, rafters, soffits and overhanging tree limbs. Norway rats tend to stay lower — crawl spaces, slab edges, garages, burrows near foundations and along drainage.
House mice can be found at almost any level, but they concentrate wherever they have food, shelter and quiet: kitchen cabinet voids, pantries, under and behind appliances, garages, insulation, water heater closets and storage boxes. Where you hear or find activity is one of the most useful clues before an inspection.
Roof rat profile
What signs point to rodent activity besides droppings?
Gnawing, rub marks, tracks, nesting material and noise all indicate rodent activity, and their scale hints at the species.
- Gnaw marks: mice leave fine paired scratches on packaging and cabinet edges; rats leave broader, coarser damage on wood, plastic and stored goods
- Runways and rub marks: greasy smudges along baseboards, joists, pipes and rafters where the same route is used repeatedly
- Tracks: small footprints and tail drag marks in dust on attic decking or garage floors
- Nesting material: shredded insulation, paper, fabric or dry pet food caches
- Damage to stored food packaging, pet food bags and cardboard
- Openings: mice can exploit gaps around 1/4 inch; rats need only about 1/2 inch
What are those noises at night?
Scratching, gnawing and scampering overhead most often indicate rodent activity in an attic or wall void, and rodents are typically most active from dusk into the night.
Light, rapid skittering in a wall void suggests mice; heavier thumping, dragging or rolling sounds across attic decking more often suggests rats. Noise in the same location night after night is a good starting point for inspection, though attics can also host other wildlife, so what is heard is confirmed visually before treatment.
How do rodents get in?
Through gaps that already exist. Rodents use utility penetrations, roofline junctions, vents, damaged soffits, garage door corners and plumbing chases rather than creating openings from scratch in most cases.
- Roofline and soffit gaps, ridge vents and damaged fascia, often reached by overhanging limbs
- Utility penetrations for cable, refrigerant lines, plumbing and electrical
- Garage door corners, worn thresholds and unsealed door sweeps
- Crawl space vents, foundation gaps and slab expansion joints
- Dryer vents, gable vents and unscreened attic vents
Why does exact identification change the plan?
It changes where an inspection concentrates and how the structure is evaluated. Suspected roof rats push attention to the roofline and attic; Norway rats push it to the foundation, crawl space and drainage; mice push it to interior voids near food and heat.
Placement decisions follow from that. Roof rat pressure often means examining tree contact with the roof, soffit and vent condition, and rafter runways. Norway rat pressure often means burrows, slab penetrations and low exterior openings. Mouse activity often means interior voids, appliance spaces and pantry areas. Working the wrong level of the building is a common reason activity persists.
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What should you do before an inspection?
Note where the activity is, protect food, and avoid disturbing the evidence you want a technician to see.
- Write down where you hear noise, at what hours, and where droppings appear
- Photograph droppings and gnaw damage with something for scale
- Move pet food and dry goods into sealed hard containers
- Clean up spilled food and secure trash
- Trim limbs that touch the roof and pull stored material away from walls
- Follow CDC cleanup guidance rather than sweeping or vacuuming droppings
When is professional rodent control appropriate?
When droppings or gnawing are found indoors, when noise recurs in the same area, or when activity continues after over-the-counter traps have been tried.
Rodent work combines inspection, trapping or treatment as appropriate, and sealing accessible entry points to reduce future pressure. No exclusion work can be described as permanent — buildings settle, weather damages materials and vegetation grows back — so ongoing monitoring is often part of a realistic plan. We offer one-time and recurring rodent service with no long-term contract required, and a 30-day warranty applies to covered services and issues.
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