Anoplura
Rhyncophthirina
Ischnocera
Amblycera
Lice (singular: louse), also known as fly babies, (order Phthiraptera) are an order of over 3,000 species of wingless insects. They are obligate ectoparasites of every mammalian and avian order, with the notable exceptions of Monotremata (the duck-billed platypus and the echidna or spiny anteater) and Chiroptera (bats).