The house mouse is commonly grayish, but the color can vary. The body is about 3 to 4 inches in length, with the tail being of equal length. Mice can gain access to a home through an opening of ¼ inch. By nature mice are herbivores; they prefer to feed on cereal grains, but will eat almost any type of food and food scraps. They require very little water, because they obtain most of their water needs from their food. They also store extra food in burrows and other hiding places. The major health risk associated with the house mouse is salmonella and leptospirosis. Mice reach sexual maturity in 5-8 weeks and female mice reproduce up to 8 times annually with litters ranging from 4 to 7 pups. That means up to 56 (8 x 7) new mice per year. They can jump up about 12 inches and can leap down from a height of 12 feet without injury.