scorpion books!!!! Do you know stand yourself

The book scorpion (Pseudoscorpion) is of the order of arthropods. You will not find it except in ancient books. Its function is to protect books from lice that feed on the glue and glue in them. Its only food is book insects. It does not cause any harm to human life or to books, but the opposite. When you find him in your old books, do not kill him, but let him work in silence, for he is at your service