an ant and a Dove

an ant and a Dove
  An ant was drinking at a river.suddenly he slipped intothe water.a dove took pity on him.she threw a small brach into the river.the ant seized it and swam back to the bank.   a few days later,the ant saw a hunter aiming a gun at the dove.hebit the man in the foot sharply.the man missed the shot,and the dove'slife was saved.   the dove felt very grateful.she made good friends with the ant.  this is one of aesop'sfables,what does the fable tell us?and what do you think about the fiendship between different people?have you had similar experience when you decide to make friends with others?please write down your opinion or story below.(请告诉文章的意思,以及后面的答案））