a cockroach
insect
Arthropods
ancient extinct life
cockroach
Periplaneta americana
cockroach
Blattaria
Cockroaches order
Four harms
Fei Lian
Free
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Cockroaches generally refer to insects belonging to the "cockroach" (scientific name), belonging to the arthropod, insects, cockroaches (Blattaria), commonly known as cockroaches, are common medical insects. Among them, only about dozens of species will invade human homes, and there are several species that are kept by humans as pets and as food for pets. Most of the species can only be seen in wild mountain streams and forests or insect museums. The most common cockroach at home, the big one is about 5.0cm long.