American cockroach
The American cockroach was first recorded in humans in the United States, but after research, it was found that its origin was actually in Africa, and it came to the Americas during the Age of Discovery; and it began to reproduce explosively in cities in the north of the United States, central Canada, and southeast. They may be more adapted to human food residues than in Africa. As for when to enter China? There are also studies that it was brought by American ships after the Qing Dynasty signed the Treaty of Wangxia.
The average length of american cockroaches is about 4 cm, they have a very strong running ability, the fastest can reach 5km/h, they can squeeze into a small space, and the male can fly for a short period of time after courtship or threat.
The American cockroach, which loves to live in bathrooms, cupboards, sewers and dumpsters, spreads at least 33 species of bacteria, 6 species of parasites, because when they crawl through decaying substances or sewage, they get bacteria on the spines of their legs and bodies and then bring them to the places where we live
Oriental cockroach
The Eastern cockroach sounds like "domestically produced"; but his origin on the Crimean Peninsula and the coastal areas of the Black Sea and the Caspian Sea was also brought to the world through trade, and "carried forward" throughout the world.
The biggest difference between the Oriental Cockroach and the American Cockroach is that the Oriental Cockroach is dark in color and has a pair of seemingly innocent wings. Males can fly briefly, females have no ability to fly, males are slender, females are short and thick, and females are larger than males. Compared with other cockroaches, oriental cockroaches prefer cool environments, and 20 to 29 degrees is their favorite. They are particularly fond of starchy foods and spoiled animal entities. After developing into an adult, the lifespan of the oriental cockroach is usually 6 to 12 months, and the average female can lay 200 eggs in a lifetime.
Oriental cockroaches prefer to stay in the sewers, leaf piles, flower beds, compared to the American cockroach, its "domestication" degree is not so high, but it will also use pipes to climb to the residents' homes to settle down; occasionally roadside manhole covers, sewers suddenly come out, most of them are Oriental cockroaches.
German cockroach
The German cockroach, whose origin is not German, is still African [cover your face]. It is a small social cockroach with a nest of one and a body length of less than 1 cm. German cockroaches are also known as "office cockroaches", they like high-heat environment; more live in wall lines, computer chassis, dressers, drawers and other places, usually will nibble on the line caused by short circuits, they have a very wide range of recipes, almost do not refuse, have a strong resistance to drugs, disease resistance, in the absence of food will appear to eat each other, German cockroaches are also the fastest mature cockroaches, food is sufficient, from eggs to adults only take 50 days.
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Why?
I don't know if you have the impression, why do the dead cockroaches we see are all belly up? In fact, there are two more mainstream answers here. The first is because the insecticide inhibits the cockroach's breathing, and the cockroach has pores in the abdomen, and the cockroach instinctively turns over in the hope of getting oxygen. The second is because the cockroach's body is too heavy relative to the foot supporting it, and when it is dying, the supporting foot cannot be contracted and balanced, resulting in a flip, and the same reason for the dead sparrow. What do you think?
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