Silverfish are small, wingless insects known for their distinctive silvery-gray bodies covered in tiny scales, which give them a metallic sheen. Their slender, teardrop-shaped form and quick, wiggling movements resemble the motion of a fish, which is how they earned their name. Typically, silverfish measure between half an inch to three-quarters of an inch long.

These nocturnal insects prefer to stay hidden during daylight hours, becoming active only at night when they search for food and moisture. They are often found in damp, dark environments that provide the humidity they need to survive. Common habitats include bathrooms, kitchens, basements, and attics—places where moisture tends to accumulate.

Silverfish are especially attracted to areas with high humidity, such as spaces with leaky pipes or poor ventilation. Cluttered storage areas that trap moisture also serve as ideal hiding spots for these pests. Their preference for damp conditions makes controlling humidity levels an important step in preventing infestations.