The cockroaches are an ancient group, with their ancestors, known as “roachoids”, originating during the Carboniferous period, some 320 million years ago.
It is popularly suggested that cockroaches will “inherit the earth” if humanity destroys itself in a nuclear war. While cockroaches do, indeed, have a much higher radiation resistance than vertebrates, with a lethal dose perhaps six to 15 times that for humans, they are not exceptionally radiation-resistant compared to other insects, such as the fruit fly.
Some species, such as the gregarious German cockroach, have an elaborate social structure involving common shelter, social dependence, information transfer and kin recognition.
Cockroach (Wikipedia) Cockroaches (or roaches) are insects belonging to the order Blattodea (Blattaria). About 30 cockroach species out of 4,600 are associated with human habitats. Some species are well-known pests.