House mice are nocturnal. Wild populations are poor competitors with other rodents, and are often displaced by other species when away from human habituation. House mice build tunnel systems which may be a short tunnel with just one chamber or a complex network with several exits and chambers. Some of these chambers may contain bedding material. They construct a system of tunnels to live in, which may be quite simple or more complex with several chambers and exits. Females are able to produce up to 10 litters in a year, each with between four to eight young. Within three weeks of birth, the young mice are independent. House mouth eats grain, seeds, roots, fungi and insects. Inside the house they seem to eat almost anything. The high infestation period in house is during the winter months.