Silverfish are actually a common household pest and are often found crawling on walls and in tubs or sinks. They have a long, slender, and flat body that has the shape of an elongated tear-drop. One of the most easily identifiable parts of silverfish though may by their three filaments that extend from the rear of the body. Their color can range depending on their stage of development, but they range from brown to a silver-ish gray when they are fully matured. Silverfish do not have wings and are about a half to one inch long.
Normally, silverfish live outdoors in cool places like under rocks, leaves, and bark of trees. Inside a building though, they will be attracted to cool, moist areas. Primarily, these places are basements, bathrooms inside tubs and sinks, in the kitchen, and laundry room. Also, because they are prone to eat virtually anything, especially cloth and paper, you will be able to find them in storage units where there is a lot of clutter and in the closets. They can also be found behind wallpaper and around frames of windows and doors.
As crazy as it sounds, silverfish will eat almost anything. This includes such things as paper, wallpaper, glue on the wallpaper, flour, starches, crayons, and much, much more. Although they are able to eat anything, silverfish populations do not boom because of their slow development. It may take several years before immature silverfish develop into their sexually mature adult stage.
They do not seem harmful because they do not cause physical irritation to people. They do not harm and cannot physically harm people or animals. However, as you may have noticed, silverfish are a nuisance because if their population is left alone, they will be able to damage such materials as wallpaper, books, other paper goods, dry foods, and more. You may also be able to find damage on clothing or other linen materials.