Cockroaches have been around for millions of years, evolving into some of the most adaptable pests on Earth. There are approximately 4,000 living species of cockroaches in the world. About 70 of these species are found in the United States.Cockroaches are commonly found in buildings and homes because they prefer warm environments close to food and water. Unfortunately, cockroaches can cause allergies and trigger asthma attacks, especially in children. They can also spread nearly 33 different kinds of bacteria.
There are about 3,000 species of spiders roaming around North America, but only two in the southern and western United States can cause serious harm when accidentally disturbed — the black widow and brown recluse.
Enthusiastically social insects, ants typically live in structured nest communities that may be located underground, in ground-level mounds, or in trees. Carpenter ants nest in wood and can be destructive to buildings. Some species, such as army ants, defy the norm and do not have permanent homes, instead seeking out food for their enormous colonies during periods of migration.
Scorpions typically eat insects, but their diet can be extremely variable—another key to their survival in so many harsh locales. When food is scarce, the scorpion has an amazing ability to slow its metabolism to as little as one-third the typical rate for arthropods. This technique enables some species to use little oxygen and live on as little as a single insect per year. Yet even with lowered metabolism, the scorpion has the ability to spring quickly to the hunt when the opportunity presents itself—a gift that many hibernating species lack.