The house mouse (Mus musculus) occurs in a range of colors, including brown, which might lead people to call it a brown mouse. Brown mice often are more active at night and feed on a variety of foods, including seeds and insects. Brown mice are good climbers and may be found atop trees or manmade structures. They are also capable of running very quickly and jumping.
If food supplies are sufficient and predators are kept at bay, brown mice produce offspring throughout the year. Females produce up to 10 mice in a single birth and offspring are ready to reproduce within 60 days.
Brown mice typically live less than a year. Brown mice are prey to a number of other animals and do not possess effective defense mechanisms. As a result, they select their nesting places carefully to ensure that predator populations are not nearby.