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Cockroaches are insects belonging to the cockroach family of the cockroach order. Its back is flat; The body is long and knobby, with threadlike antennae; The prosternal backplane is large, peltate like; Leathery forewings; The hind wing is membranous, fan-folded at rest; Some wings are long, some short, and some have no wings at all; Polynosy tail; Male cockroaches have long and awning at the end of the abdomen (some species have degraded or no awning). This insect has the air of incorruptible ginger, also known as "flying incorruptible".

Cockroaches are distributed all over China, mainly in tropical, subtropical and temperate areas. Like to live in warm, wet, food rich and diverse places; Like dark, afraid of light, nocturnal. Cockroaches are omnivorous insects that eat a wide variety of foods. Bread, rice, pastries, meat and vegetables cooked food, melons and fruits and drinks for food. In addition, they also eat cotton and wool products, leather products, paper, soap and so on. In places such as outdoor landfills, sewers and public toilets, they feed on rotten organic matter and even chew on dead animals. Cockroaches can breed and move all seasons, females generally give birth to 14-32 ootheca at a time, and the life span is generally 2-4 years.

Cockroaches can be used as medicine, salty, cold, small poison, with the effect of eliminating stasis, detoxification and diuresis. The body surface and digestive tract of cockroaches will carry a variety of pathogenic microorganisms, and its secretions, excretions, vomitus can also cause allergic reactions in the human body. Cockroaches are known as the "first of the four evils" in China and are very destructive.

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