The term "lice" refers to small, wingless insects that belong to the order Phthiraptera and suborder Anoplura. These parasitic insects feed on blood from their hosts, which can include humans as well as animals such as birds or rodents. Lice are typically found in the hair or fur of their host and lay eggs (nits) that hatch into more lice. They cause itching and discomfort to their hosts, and infestations known as "pediculosis" can be difficult to treat and eradicate.