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Rodent identification guide
House Mouse in Georgia: How to Identify It and Tell It From Look-Alikes
The house mouse is a small, light brown to gray rodent with relatively large ears and a tail that has almost no fur. UGA Extension says its droppings are about the size of rice grains and that it tends to stay close to home, often in one corner of a room or attic.
Last reviewed October 19, 2026. Sources are listed at the end of the page.
Identification
How to recognize a house mouse
| Feature | What to look for |
|---|---|
| Size | About 3 in. long without the tail (UGA); about 5 to 7 in. including a 3 to 4 in. tail (UC IPM) |
| Weight | About half an ounce (UC IPM) |
| Tail | Almost no fur; UGA calls it a naked tail, unlike the slightly furry tail of native mice |
| Ears and eyes | Relatively large ears and small black eyes (UC IPM) |
| Color | Usually light brownish to gray (UC IPM) |
Seeing the animal is not required. Most identifications start with droppings, gnawing and nests.
Signs a house mouse is living in your home
- Droppings about the size of rice grains (UGA). Rat droppings are closer to raisin size.
- A little hole with chewed edges, which UGA calls a sign of rodent activity.
- Nests of chewed or finely shredded paper, cloth or other fibers in boxes, drawers and attics (UGA, UC IPM).
- Odor: UGA says a musty, urine-like smell usually means mice, not rats; UC IPM describes a musky odor in large or long-term infestations.
- Gnaw marks about 1/12 in. (2 mm) wide; rat marks are about twice that (UC IPM).
Habits that explain where you find them
UGA says mice hide during the day and come out at night, stay near home, and prefer to run along walls and baseboards. UC IPM adds that house mice are excellent climbers that can run up any rough vertical surface and seldom travel more than 30 feet from their nest and food. Females can start breeding at about two months and can breed at 30-day intervals (UGA), so a few mice can become many in one season.
Commonly confused with
| Animal | How it differs |
|---|---|
| Deer mouse | Larger eyes and a white underside with a sharp dividing line (UC IPM). See Deer Mice. |
| Native mice | A slightly furry tail instead of a naked one (UGA) |
| Young rat | Larger droppings (about raisin size) and wider gnaw marks. Our Rat vs Mouse guide compares them side by side. |
What to do next
Seal gaps and openings larger than 1/4 inch with materials mice cannot chew; UC IPM lists plastic screening, rubber, vinyl, expanding foam and wood as ineffective. Inside the house, UGA recommends traps rather than poison baits, because poisoned rodents often die in walls or behind appliances. Clean droppings the way CDC describes: ventilate, wear gloves, and wet the droppings with disinfectant instead of sweeping or vacuuming. Our step-by-step guide to getting rid of mice covers sealing, trapping and cleanup in detail.
Common questions
Frequently asked questions
How small a gap can a house mouse use?
UC IPM says house mice can squeeze under gaps 1/4 inch tall and through openings 3/8 inch wide. UGA says mice and rats can enter through openings as small as a dime.
Is it a house mouse or a field mouse?
Look at the tail and underside. UGA says the house mouse has a naked tail while native mice have a slightly furry tail, and UC IPM says the deer mouse has larger eyes and a white underside with a distinct line.
Is it safe to sweep up mouse droppings?
No. CDC says not to vacuum or sweep rodent urine, droppings or nesting materials. Ventilate for 30 minutes, wear gloves, spray until very wet with a bleach solution or an EPA-registered disinfectant, let it soak, then wipe up with paper towels.
Where this information comes from
Sources
Facts about identification, biology and safety come from the sources below, retrieved on October 19, 2026. Publication or review dates are given where the source shows one.
- Rats and Mice: Get Them Out of Your House and Yard (Circular 970), UGA Extension — by Michel Kohl and Michael T. Mengak; republished with minor revisions November 5, 2025
- Pest Notes: House Mouse (Publication 7483), UC Statewide IPM Program, University of California — by N.M. Quinn and M. Frye; updated July 2025
- Pest Notes: Rats (Publication 74106), UC Statewide IPM Program, University of California — by N.M. Quinn; updated June 2025
- How to Clean Up After Rodents, CDC — dated April 8, 2024
More rodent guides
Browse the full Atlanta Pest Library, or read another rodent guide:
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