Historical
It is assumed that the crab louse was first transmitted from apes to human ancestors about 3.3 million years ago. This was presumably due to the hunting of gorillas, contact with their environment, and their fur. According to studies, human crabs and gorilla crabs have the same ancestor before they developed independently.
This led to the above-mentioned assumption. Constantly itching scalp can be an indication of a lice infestation. The uninvited guests can be treated specifically to get rid of them. Here you will get to the topic: Head lice