The house mouse can be found in a wide range of urban and rural buildings, although it may live for part of the year outdoors. Mice live in nests, which are often built inside houses, especially during the winter. Nests are built wherever there is access to a good source of food. Spaces under the floor and lofts are favoured places for nests, which are built out of cloth, wool and paper. Mice are mainly active at night and can be heard running about as they search for food. Mice can squeeze through cracks as small as 5 mm. Their favourite foods are cereal products, although they will eat almost anything. Most of the damage they do is by gnawing and ripping open packets. They also foul food with urine and droppings. Mice will gnaw their way through wood to get to sources of food so it is important to get rid of mice quickly before they damage pipe cables and insulation. Field mice, on the other hand, usually live in hedgerows or outbuildings.
Rabbits have a very fast reproductive rate. The breeding season for most rabbits lasts 9 months, from February to October and gestation is about 30 days. The average size of the litter varies but is usually between 4 and 12 babies, with larger breeds having larger litters. A kit (baby rabbit) can be weaned at about 4 to 5 weeks of age. This means in one season a single female rabbit can produce as many as 800 children, grandchildren, and great-grandchildren. All rabbits except the cottontail rabbit live underground in burrows or warrens, while hares live in simple nests above the ground (as does the cottontail rabbit), and usually do not live in groups. Hares are generally larger than rabbits, with longer ears, and have black markings on their fur.