Silverfish are nocturnal, elongated and flattened insects typically 13–25 mm (0.5–1 in) long. Their abdomens taper at the end, giving them a fish-like appearance. The newly hatched are 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 off the end of their body, one facing left, and one facing right. Silverfish can be located in your roof cavity usually feeding on stored items in cardboard boxes. Recommended service: General Insect Treatment & Roof Cavity Dusting. For more info visit https://en.wikipedia.org/wiki/Silverfish