Cockroaches have white blood that flows freely through the body. In other words, they do not have blood vessels for conducting blood. Interestingly that even the heart of this insect is like a simple pipe that pumps blood to the front and back of the body.
The eye of this insect has 4000 segments, which help to see all directions at one time.
An interesting fact, the cockroach can live without a head, since the cockroach's brain is not in the head, but throughout the body. But without a head, they can die within ten days, due to lack of water, because they have nothing to drink.
Interestingly, cockroaches spend most of their time (about 75%) hibernating.
Cockroaches are widely used in folk medicine. Cockroach tea is used to treat dropsy, and cockroaches sauteed with garlic are used to treat indigestion. In the east, cockroaches are used in dried and powdered form for the treatment of the urinary tract.
Cockroaches can live for more than one month without food. An interesting fact, cockroaches can hold their breath for more than forty minutes without interruption. They can run 4 kilometers in an hour, and they can also swim.
There are 4000 species of cockroaches, and only 30 species live in our house. Tropical cockroaches reach up to 9 cm in length, but they are small compared to cockroaches that lived 250 million years ago, even before the dinosaurs. They were about 50 cm long.
The body of a cockroach is so resistant to radiation that they can even live in a nuclear reactor. Cockroaches are capable of conditioned reflexes. Interesting fact, researchers have taught cockroaches to salivate in response to stimuli, as the Russian scientist Pavlov did a hundred years ago with dogs.
On the sides of the cockroach there are small hairs that react to the slightest vibrations in the air. And given that a cockroach can change direction 25 times per second, it is almost impossible to catch it with your bare hands.