"Silverfish are nocturnal, elongated and flattened insects typically 13-25 millimeters (0.51-0.98 in) long. Their abdomen tapers at the end, giving them a fish-like appearance. They are born whitish, but develop a greyish hue and metallic shine as they get older. They have three long cerci at the tips of their abdomens, one parallel to their body, one facing left, and one facing right. They have long antennae, and move in a wiggling motion that resembles the movement of a fish. This coupled with their appearance, influences their common name. Silverfish are considered a household pest, due to their consumption and destruction of property. These include glue, book bindings, paper, photos, sugar, coffee, hair, carpet, clothing and dandruff."[1]

[1] Wikipedia