Head lice are about the size of sesame seeds. Head lice have six legs equipped with claws to grasp the hair. Head lice are crawling insects. They cannot hop, jump, or fly. Head lice do not thrive on pets.
Head lice are small, wingless insects which feed on human blood.
They need human blood in order to survive. Head lice off of their human hosts will starve. The NPA suggests that, in most cases, a head louse will not survive for more than 24 hours off of its human host. The National Pediculosis Association , Inc.