A fable is a short, realistic tale, which seeks to teach us some moral or virtue, and thus improve our conduct. This advice is cloaked in the interactions of animals of the field, birds of the air, trees of the wood, and beasts of the forest, so that we do not notice the presence of the adviser.
The lesson of the fable is thus easy to accept, as we are spared the superiority of the counselor. Unconsciously, our sympathies are enlisted for the pure, honorable, and praiseworthy, and our indignation is raised against what is low, ignoble, and unworthy.
Each fable should speak for itself - accordingly my commentary is minimal