Small (4-7 mm long), light orange to grey, wingless, flat, round insects. Adults and nymphs appear at night to feed on blood. They occur in human dwellings, animal shelters, bird nests and bat roosts, where they hide in crevices and various fabrics.
Bed bugs are attracted to a heat source in order to find its victims. The bite from these insects produces a strong reaction with swelling and irritation that can last for several days.