How long have cockroaches lived on the earth …

About 400 million years ago in Silurian, primitive cockroaches appeared on the earth. Its appearance has not changed much for hundreds of millions of years. It is flat, dark brown and usually of medium size. Small head, move. Antennas are long and filiform, and compound eyes are developed.

Cockroaches have flat wings, leathery front wings and membranous rear wings, which are basically the same size and cover the back of abdomen. Some species have no wings. Not good at flying, can run. Incomplete metamorphosis, laying eggs in the egg sheath. There are about 6000 species, mainly distributed in tropical and subtropical regions, living in the wild or indoors.

Extended data Cockroaches like to live in warm, humid, food-rich and crevice places, which are the four basic conditions for their reproduction. All buildings where people live and live generally have these conditions, so cockroaches have become health pests that infringe on thousands of households. Love of warmth and tide is an important habit of cockroaches.

No matter in restaurants, families, or on trains and ships, the kitchen is always the most seriously violated place. Even in the kitchen, they generally like to live near stoves and pools. It is also an important habit of cockroaches to lie down during the day and go out at night. Hiding in dark places during the day, such as indoor furniture, cracks in walls, corners of caves, sundries, etc. At night, especially after the lights are turned off and people are asleep, they go out for activities, or seek food or courtship.

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