There are over 4,000 different varieties of cockroaches, but only about thirty of them can comfortably live with humans. This number can be further reduced to include only four varieties; the main species that cause problems in homes and businesses in America.
The four main species are the American, German, Asian, and Oriental cockroaches. These vary in size from about 1/2" (German), up to 2" (American). In America, the species that is most common in homes would most likely be the German variety.
Cockroaches increase in population at a very rapid rate. The German cockroach female lives about 200 days. Each egg case that she lays includes thirty to fifty eggs. In her lifetime, she will produce between four to six egg cases. German cockroaches are clearly able to thrive.
Once cockroaches infest a home, they are rarely seen. Cockroaches are nocturnal and can live up to a month with little or no food. They can also survive by eating book bindings, furniture, glue, soap, dead insects, shoe linings, and more.
The presence of cockroaches can lead to a definite impression of uncleanness- especially if your guests see them. Contrary to popular belief, a cockroach infestation is not necessarily an indication of poor hygiene. However, an untidy environment will make it all the more difficult to get rid of them. The presence of cockroaches can also lead to health problems, including asthma in children. If you spot a cockroach at home or work, there are likely more of them concealed nearby.
Contact a pest professional to avoid letting an infestation get out of hand.