Scratch, this might be more than you want to know.
Mice are nocturnal creatures, and, therefore, are rarely seen by the homeowner. However, the opposite is true for hikers. Hikers are just getting to the shelters when the mice are waking up. Mice are “nibblers” and may make 20-30 visits to different food sites each night. They really do run around in those shelters are night long.
Mice feed on a wide variety of foods but prefer seeds, nuts and cereal grains (GORP). Mice also are fond of foods high in fat and protein such as candy, energy bars and sweets (the same food that hikers are fond of).
Mice forage only short distances from their nest – usually not more than 10-25 feet. When food and shelter are adequate, their foraging range may be only a few feet. Mice are very inquisitive and will investigate each new object placed in their foraging territory. Mice are able to squeeze through extremely small openings narrower than the diameter of a dime.
Mice are prolific breeders, producing 6-10 litters continuously throughout the year. The greatest danger with mice is the contaminated food and clothing damaged by their droppings and urine, or damaged by their gnawing.
Bilko