Lice -LRB- singular : louse -RRB-, -LRB- order Phthiraptera -RRB-, also known as fly babies or Nits, are an order of over 3,000 species of wingless insects ; three of which are classified as human disease agents.
Lice -LRB- singular : louse -RRB-, -LRB- order Phthiraptera -RRB- are an order of wingless insects. There are more than 3,000 different species ; three are classified as human disease agents.