The order Thysanura contains some household pests, including silverfish and firebrats. Thysanura are wingless insects with flattened bodies and mouthparts ideal for chewing. Silverfish are are usually found it damp places within or around the home while firebrats are found in hot, humid places. Thysanura are very fast moving and hide in cracks when bothered. They are most active during the night.

Information from Department of Entomology, Texas A&M University