You are reading Aesop's Fables by Aesop
THE HAWK, THE KITE, AND THE PIGEONS

The Pigeons in a certain dovecote were persecuted by a Kite, who every now and then swooped down and carried off one of their number.  So they invited a Hawk into the dovecote to defend them against their enemy.  But they soon repented of their folly:  for the Hawk killed more of them in a day than the Kite had done in a year.