Cockroaches are nocturnal and like to squeeze themselves into narrow crevices, so they spend most of their time during the day hiding in their habitats, and are fast enough to move 28 cm per second. In addition, they live in groups and are omnivorous, eating everything from the dead bodies and excrement of their companions to human saliva. In particular, when eating new food, they vomit out the previously eaten half-digested food, causing various infectious diseases such as food poisoning, and are a pest that transmits more than 40 types of harmful pathogens to humans, causing atopy and asthma.