As mammals, mice have two kinds of hair: fur and whiskers. Realistically, we can break it down even further by denoting the two different kinds of fur: the underhair and the guardhair. The uderhair—that is, the hair closest to the body—is thick and soft, and insulates the mouse, protecting it from often-drastic seasonal temperature changes. The underhair, in turn, is protected by the guard hair, which gives the mouse its coloration, allowing it to blend in with its surroundings. Like many mammals, mice will shed their coats in summer, only to grow it back again in the winter.
Cat and dog owners will likely be familiar with just how sensitive mammalian whiskers can be. These highly sensitive stiff hairs aid the mouse’s navigation, especially in the dark, allowing it to find its way with ease, even in the darkest, most enclosed environments. The base of each whisker is connected to a sensory nerve in the skin which, in turn, send signals directly to the brain, telling the mouse all about its surroundings.
Mice are incredibly agile thanks, in part, to their flexible feet. Likewise, their well-developed limbs allow them to manipulate materials while building nests and eating. Mice have four toes on their front feet and five on their hind feet; small nails protrude from each of these toes, further increasing a mouse’s ability to grip various surfaces while running and climbing.
Mice also possess a prehensile tail that’s commonly used for balance and support. Depending upon the species, the mouse’s tail will be about as long as its body. While not completely naked, the tail is covered almost exclusively in scaly skin and tiny, nearly translucent hairs. Mice attempting to flee from a predator can purposely loose a portion of their tails, but their maneuvering and balancing ability will be compromised.
Like humans, mice have heterodontal teeth, meaning that they have different kinds of teeth that can be used for different purposes. They possess molars as well as two upper incisors and two lower incisors, which grow continuously. Mice grind their teeth together in order to keep them sharp, thus along them to cut through almost any material—as many aggrieved homeowners can tell you.
The natural facilities of the mouse allow it to adapt to almost any environment, meaning it will make little distinction between the shelter of a fallen log and your warm, dry attic. If beset by an infestation of mice, the best recourse for a savvy homeowner would be to contact their local pest control professional.