Silverfish are small, silver-blue insects. 
Like many pests, they thrive in moist, dark, undisturbed areas, like attics, basements, and under the sinks in bathrooms and kitchens. They don’t bite or do much damage to the structure of a building; instead, they just eat clothing, paper, or leftover trash like glue, cereal boxes and dead skin cells.
They are nocturnal and move quickly throughout the night. Centipedes, earwigs and spiders are their natural predators, but all of those pests provide a problem in the home. Silverfish populations can grow exponentially in short periods of time – prompt and thorough professional treatment is the recommended solution.