Cockroaches are attracted to warm, moist surroundings. They spend the daytime in dark, isolated sites under refrigerators, stoves, false bottoms in kitchen cabinets, in the backs of cabinets and in crevices between baseboards and floors or cabinets and walls. They may also be detected behind pictures or within electronic equipment. A number of these openings will eventually lead to voids in the stud walls. The insects leave these sites at night to hunt for food and water. The presence of cockroaches during the day may intimate a large population.
There are about 3,000 sorts of cockroaches in the world, out of these, three are most common. Those are the German cockroach, the American cockroach, and the brown-banded cockroach.