Ants will invade any structure once a food supply or nest site has been found. Do not believe a living area must be "dirty" for ants to infest it. They can become a real nuisance when they enter homes in large numbers, and will quickly find their way into any improperly sealed food containers.

Cockroaches carry many diseases such as dysentery, typhoid, gastro-enteritis and salmonella. They will happily infest any area where food is prepared or is left lying around, such as restaurants or household kitchens, and often hide out in drains during the day. They are fast breeders, and the largest species can grow up to 1.5 inches in length. They have large appetites and will eat virtually anything.

Silverfish are nocturnal creatures, and prefer to hide in damp cool places during the day. They eat and spoil preserved foods such as rolled oats, flour and dried beef.

Bedbugs are small, flat, reddish-brown insects, which hide during the day and emerge at night to look for blood. They have a special ingredient in their saliva that keeps blood from clotting while they eat their fill. Normal signs of their activities are red itchy bumps that can occur all over the body.