Lice live on only one or some related animal species. This feature of lice in some cases gives scientists the opportunity to find out the proximity of host host species. So don't worry about your pet's lice getting in with you.
Three types of lice parasitize humans - head lice, pubic lice and body lice.
Head lice prefer the warmest places on a person's head, such as behind the ears or in the lower part of the back of the head.
They feed on blood every 2-3 hours, biting through the scalp of a person. Typically, an adult drinks from 1 to 3 μl (0.001-0.003 ml) of blood.
Lice saliva irritates the skin and causes severe itching, so the lice carrier often scratches the bite site.
Lice always give preference to their owners. A louse removed from a person - if there is a choice - always returns to him. About a hundred years ago, with the help of this insect, the Swedes in Gradenburg held elections for burgomaster, writes Pavel Justinovich Marikovsky. - Applicants for this position sat around the table and put their beards on it. There was a louse in the middle of the table. The burgomaster was elected the one on whose beard she crawled.
In the absence of hair, they cannot live for more than 2-3 days. They do not know how to jump, fly or swim, but they do not freeze out when a person is in the cold for a long time. They retain their vitality after washing their hair, firmly clinging to the hairs with paws equipped with special hooks and blocking the airways located on the sides of their body.
They live only about 40 days, but reproduce very quickly. A female head louse is capable of laying up to 10 eggs per day. The eggs are usually found at the roots of the hair, close to the surface of the scalp. Removing nits is more difficult than removing the lice themselves. Therefore, the sooner you find head lice, the easier it will be to get rid of them.
Lice have nothing to do with hygiene. Lice do not distinguish between short or long hair, clean or dirty hair.
In medieval Europe, lice were considered "pearls of God", since they carried "Christian blood" in themselves, not washing all their life was a sign of special holiness. Among the townspeople, looking for lice from each other was a sign of good friendship.
The pubic louse never lives on the scalp. This is due to the fact that the limbs of the pubic louse are adapted only for holding and moving along the hair of a triangular section, in contrast to the scalp, which has a round section of hair.
The body louse lives and reproduces in clothes, but only "to eat" comes to a person. In 1909, Charles Nicole, in experiments on infecting body lice on monkeys sick with typhus, first established that they are a carrier of typhus.
Most lice drugs work in two ways - either as an insecticide that kills insects, or as an air blocker for parasites (kerasin, silicone shampoos or creams). In the first case, the reptile dies from poisoning, in the second from suffocation :)