The house mouse is the species of mouse everyone thinks of when they hear the word mouse. It is because they live in close association with humans that they are one of the most familiar small mammals to humans. House mice are similar in size to our native deer mouse but they are a solid grayish-brown color above and below. Their tail is also scaly like a Norway rat and not covered with fur like the deer mouse.

House mice are occasionally found in fields, but usually in buildings. They will eat most anything and breed year round having as many as a dozen litters a year of 5-8 young each. Young are able to breed at six weeks. Because this mouse chooses to live near humans, it is considered a pest.