Cockroach is the general name of insects in the class of Insecta, is a kind of ancient insects, as early as 0.35 billion years ago in the Carboniferous period has appeared. The body is flat, oval or oval, usually brown or black, with two pairs of wings, leathery forewings and membranous hindwings, good at fast running, and some species can also fly. The head is small, hidden under the front chest back, and has a pair of long, flexible antennae for sensing the environment. They are omnivorous insects that eat almost anything, even in extreme cases, cannibalism. Strong reproductive ability. Widely distributed in the world, often inhabited in warm and humid environment. Considered a pest, it spreads disease.

It is a larger species in the cockroach family, commonly known as the American cockroach. Native to Africa, but now widely distributed around the world with human activities, especially in warm and humid environments. The body length is about 40-50 millimeters, with a reddish brown outer shell and long antennae. Wings are well-developed and able to fly, but tend to crawl. Known for its strong survival ability and adaptability, it can survive under extreme conditions, such as one month without food and one week without water. In the environment where humans live, they are usually considered pests and may contaminate food and spread diseases

It is a widely distributed insect, originally from Africa, but now it has spread all over the world. It is one of the largest household pests, with an adult body length of up to 38 millimeters. The external features include a reddish brown shell, a long and flat body, and a pair of large wings. Can survive in various environments, both indoors and outdoors, and feed on various organic substances such as food waste, paper, books, and clothing. Their presence is unpleasant and may carry pathogens and allergens, posing a threat to human health. Excretions and shed skin can also cause allergic reactions. Although able to fly, they usually prefer to crawl quickly on the ground.