Beasts Begone! House Mouse
HOUSE MOUSE 
Small (less than 1 oz.) slender grayish brown rodent with a largely hairless tail. Largely (but not exclusively) nocturnal. Frequent invader of basements, wall void, attics, crawl spaces, and human living spaces of buildings. Particularly common in urban areas.
Access Routes
Physical cover near the foundation can facilitate access; check firewood stacks, debris piles, and crawl spaces under decks or additions.
Entry Sites
Holes larger than 1/4 inch, usually in vicinity of foundation.
Sounds
Squeaking. Scampering; gnawing.
Gnaw Marks and Food Remains
Gnaw marks on wood, plastic, etc.
Fecal Droppings: 
Dark, elongated, hard; about 1/8 to 1/4 inch long. Most frequent in areas of most mouse activity.
Odor
Musky.
Hair
White to gray; 1/8 to 1/4 inch long.
Other Signs
Urinary "pillars" (small mounds of grease, urine, and dirt). Body rub marks around entry sites and along runways. Runways in insulation. Nests (generally loosely woven balls of shredded fibrous material). Urine stains (under UV light).
Tracks:  Front: 1/4 in. Hind: 3/8 in
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