Pediculus Humanus Capitis Of the many sorts of parasites, Pediculus Humanus Capitis, more commonly known as Head Lice, has to be one of the more fascinating ones. An ectoparasite, it lives on the exterior portions of the host. A Head Louse must feed on blood several times daily and resides close to the scalp to maintain its body temperature. Head Lice are also very human specific,and feed only on humans. It results in head lice infestation on the scalp of its human host. Infestation with Head Lice is common and occurs worldwide. Preschool and elementary-age children 3 to 11 years of age are feasted on most often. Women are also most likely to contract lice as well, most likely due to more frequent head to head contact