The little blue cattle louse is the common name for the Solenopotes capillatus in the United States but is known as the tubercle-bearing louse in Australia. This louse is the smallest of the sucking lice that occur on cattle and is a relatively immobile species. They are found all around the world in distribution but are restricted mainly to areas with domestic livestock. The little blue cattle louse is most often found on the head of its host, primarily the face and jaw region, but sporadically is found on other body parts. It is relatively immobile so typically will not relocate on its host’s body. The louse is spread by direct contact and is considered an ectoparasite.