Cockroaches are prevalent throughout the world and have survived virtually unchanged through millions of years of evolution. Cockroaches spread diseases.
Cockroaches are among the most common pests in many homes and other buildings. Of over 3500 identified species only a few are of importance to people because they have adapted to living in buildings
At night they search for food in kitchens, food storage places, rubbish bins, drains and sewers. They are pests because of their filthy habits and bad smell. Some people may become allergic to cockroaches after frequent exposure. Cockroaches can sometimes play a role as carriers of intestinal diseases, such as diarrhoea, dysentery, typhoid fever and cholera.