A house mouse is typically gray in color with a cream-colored stomach. They range from 5.5 to 7 inches in length, including their tail. House mice can adapt to the surroundings of your mid-Missouri home quickly and are able to breed rapidly, making them one of the most common household pests in the world. A female house mouse can give birth about every three weeks to six babies at a time, totaling to about 35 per year! They can nest just about anywhere, including attics, basements, inside walls and behind furniture or appliances.