is an obligate ectoparasite of humans that causes pediculosis capitis.[1] Head lice are wingless insects spending their entire life on the human scalp and feeding exclusively on human blood.[1] Humans are the only known hosts of this specific parasite, while chimpanzees host a closely related species, Pediculus schaeffi. Other species of lice infest most orders of mammals and all orders of birds,[1] as well as other parts of the human body.