The wood mouse is a small rodent, about 8 to 10 cm in length, plus another 8 to 10 if the tail is included. This is devoid of hair and is always equal to or greater than the rest of the body. The coloration of the animal is reddish-yellow on the upper part, while the belly is whitish and is clearly delimited by color. The male is usually older than the female, although sexual dimorphism can not be considered to exist. The eyes are large and dark, the head is large and elongated and the ears are also larger, which makes it possible to differentiate them from mice of the genus Mus.