Beasts Begone! Appendix A: Animal Identification
White-footed Mouse and Deer Mouse
Small (approximately 1 oz.), with relatively large ears and eyes. Bicolored, including tail: upper parts are brownish, lower parts are white. Tail long and furred. Largely nocturnal. Frequent invaders of basements, attics, wall voids, and miscellaneous crawl spaces. Particularly common in rural and suburban situations.
Trees and bushes adjacent to the structure; certain types of siding; brick chimneys. Physical cover near the foundation can facilitate access; check firewood stacks, debris piles, and crawl spaces under decks or additions.
Holes larger than 1/4 inch in locations similar to red squirrel and Eastern chipmunk. Check holes in fascia boards of eaves, dormer tie-ins, architectural returns, and similar sites along the roof line; vents (roof, soffit, gable, fan); uncovered chimneys; deteriorated roofs, eaves, and walls. Often gains access to crawl spaces and wall voids via attached garages. The white-footed mouse, particularly, is a good climber and often enters high on a building.
Squeaking. Scampering; gnawing.
Gnaw Marks and Food Remains
Gnaw marks on wood, plastic, nut shells, etc. Food caches (the white-footed mouse in particular will rob traps set for larger animals and cache the food).
Dark, elongated, hard; about 1/8 to 1/4 inch long. Similar to house mouse droppings.
Lacks musky odor of house mouse.
Back and sides of animal: brown to reddish brown, black tipped, 1/4 to 1/2 inch long.
Belly: each hair partitioned into black and white segments, 1/8 to 1/4 inch long.
Body rub marks around entry sites. Runways in attic insulation. Nests made up of fibrous materials and lined with fine materials such as fur, feathers, or shredded cloth.