The house mouse is a mammal that is very comfortable living in close proximity to human beings. They are normally from 7 to 12 cm in length and brownish in colour with large eyes and large circular ears. They can climb but usually live at ground level. The gestation period of a house mouse is about 3 weeks and they become sexually mature in about 8 to 12 weeks. They normally produce about 5 to 16 young and have 7 to 8 litters per year.

The house mouse will typically eat about 3g of food per day. Their preferred foods are cereals and grains but they are very opportunistic eaters and enjoy foods with high sugar content.

Another mouse species to be encountered is the Field Mouse ( Apodemus sylvaticus) also referred to as the Wood mouse. This species has a more sandy brown pelage and a white/creamy under belly.