Because cockroaches are so comfortable living with people, it is hard to control them unless you know some facts about them. The cockroach has three stages in its life cycle - egg, nymph, and adult. Eggs are grouped in a small bean-shaped capsule that is produced by the female. This capsule is usually left in a protected place or may be carried by some types of cockroaches until it hatches. Depending upon the type of cockroach, 10-30 nymphs hatch from the egg capsule.
Nymphs look like small, wingless adults.
Over a period of weeks the nymphs grow larger and become sexually mature adults. Cockroaches are active at night. When cockroaches are seen during the day, it is a sign that many more are hiding. Cockroaches prefer to hide in tight places, like cracks in walls, gaps in joints, or under piles of trash. They are attracted to dark, warm, humid places and are common in kitchens, bathrooms, or basements.